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Teflon, a product advertised as making life easy, is also used in a different form to keep stains off carpets and clothing. DuPont calls these products the housewives' best friend. Teflon and the chemicals used in its production have grown into a $2 billion-a-year industry. This includes ammonium perfluorooctanoate, known as C-8, which has been linked to cancer, organ damage and other health effects in tests on laboratory animals. In two to five minutes on a conventional stovetop, cookware coated with Teflon and other non-stick surfaces can exceed temperatures at which the coating breaks apart and emits toxic particles and gases linked to hundreds, perhaps thousands, of pet bird deaths and an unknown number of human illnesses each year, according to tests commissioned by Environmental Working Group (EWG).
"In retrospect, this may seem like one of the biggest, if not the biggest, mistakes the chemical industry has ever made," said Jane Houlihan, vice president for research at the Environmental Working Group, an activist organization. "And how could they not be in our blood?" Houlihan said. "They're in such a huge range of consumer products. We're talking about Teflon, Stainmaster, Gore-tex, Silverstone. So if you buy clothing that's coated with Teflon or something else that protects it from dirt and stains, those chemicals can absorb directly through the skin." According to the Environmental Protection Agency, some of the highest C-8 levels were found in children.
Even DuPont says that it cannot rule out that Teflon-connected products, such as Stainmaster carpet treatment, give off the chemical, although at blood levels the company says are far too small to be a problem. "We are confident when we say that the facts, the scientific facts, demonstrate that the material is perfectly safe to use," Uma Chowdhry, Dupont's vice president of research and development, told 20/20. Chowdhry is the DuPont executive chosen to defend Teflon, and she claims that the substance is completely safe, despite the fact that the key chemical, C-8, is in everyone's blood. "You get some fumes, yes," said Chowdhry, "and you get a flu-like symptom, which is reversible." Chowdhry said the flu is temporary and lasts at most for a couple of days. She also added that a warning about the flu, while not on the pans themselves, is on the DuPont Web site.
Now the unexpected discovery of the almost universal contamination of Americans' blood from C-8, combined with worrisome laboratory studies, has led to a high priority investigation by the EPA of the chemical's risks. It's a potential threat," said Houlihan. "And the EPA's moving fast in studying this. Human blood levels are too close to the levels that harm lab animals. That's why they're moving fast." The greatest concern about C-8 is that it may cause possible long-term harm to a generation that has grown up using Teflon products. Scientists say that if there are any long-term effects, the first place they'd look for them would be in the people who have had the greatest exposure to the chemicals the people who work, live and drink the water near the Teflon plant in West Virginia.
In new tests conducted by a university food safety professor, a generic non-stick frying pan preheated on a conventional, electric stovetop burner reached 736°F in three minutes and 20 seconds, with temperatures still rising when the tests were terminated. A Teflon pan reached 721°F in just five minutes under the same test, as measured by a commercially available infrared thermometer. DuPont studies show that the Teflon offgases toxic particulates at 464°F. At 680°F Teflon pans release at least six toxic gases, including two carcinogens, two global pollutants, and MFA, a chemical lethal to humans at low doses. At temperatures that DuPont scientists claim are reached on stovetop drip pans (1000°F), non-stick coatings break down to a chemical warfare agent known as PFIB, and a chemical analog of the WWII nerve gas phosgene.
For the past fifty years DuPont has claimed that their Teflon coatings do not emit hazardous chemicals through normal use. In a recent press release, DuPont wrote that "significant decomposition of the coating will occur only when temperatures exceed about 660 degrees F (340 degrees C). These temperatures alone are well above the normal cooking range." These new tests show that cookware exceeds these temperatures and turns toxic through the common act of preheating a pan, on a burner set on high.
In cases of "Teflon toxicosis," as the bird poisonings are called, the lungs of exposed birds hemorrhage and fill with fluid, leading to suffocation. DuPont acknowledges that the fumes can also sicken people, a condition called "polymer fume fever." DuPont has never studied the incidence of the fever among users of the billions of non-stick pots and pans sold around the world. Neither has the company studied the long-term effects from the sickness, or the extent to which Teflon exposures lead to human illnesses believed erroneously to be the common flu.
The government has not assessed the safety of non-stick cookware. According to a Food and Drug Administration (FDA) food safety scientist: "You won't find a regulation anywhere on the books that specifically addresses cookwares," although the FDA approved Teflon for contact with food in 1960 based on a food frying study that found higher levels of Teflon chemicals in hamburger cooked on heat-aged and old pans. At the time, FDA judged these levels to be of little health significance.
Of the 6.9 million bird-owning households in the US that claim an estimated 19 million pet birds, many don't know that Teflon poses an acute hazard to birds. Most non-stick cookware carries no warning label. DuPont publicly acknowledges that Teflon can kill birds, but the company-produced public service brochure on bird safety discusses the hazards of ceiling fans, mirrors, toilets, and cats before mentioning the dangers of Teflon fumes.
As a result of the new data showing that non-stick surfaces reach toxic temperatures in a matter of minutes, EWG has petitioned the Consumer Product Safety Commission (CPSC) to require that cookware and heated appliances bearing non-stick coatings must carry a label warning of the acute hazard the coating poses to pet birds. Additionally, EWG recommends that bird owners completely avoid cookware and heated appliances with non-stick coatings. Alternative cookware includes glass, stainless steel and cast iron, neither of which off-gases persistent pollutants that kill birds.
The government has never rigorously studied the safety of Teflon pans. The Food and Drug Administration approved Teflon as a Food Contact Substance in 1960 after reviewing a hamburger frying study in which elevated levels of fluorinated compounds were found in the hamburger fried on Teflon. FDA judged these levels to be of little health significance. After a prominent Midwestern paper reported on cases of bird deaths and human polymer fume fever, the Consumer Product Safety Commission stated that the Commission would investigate only upon receiving a formal complaint with underlying data. CPSC failed to ban Teflon-coated drip pans, which can reach 1000°F, even after well-publicized poisoning incidences.
Environmental Working Group reviewed 16 peer-reviewed studies detailing experiments conducted over the past 50 years, showing that heated Teflon decomposes to 15 types of toxic gases and particles. Many of these studies were conducted by DuPont's own scientists, who began studying heated Teflon (PTFE) in the 1950s when DuPont workers were developing polymer fume fever that the company found could lead to a potentially fatal condition called pulmonary edema. Since DuPont's discovery of polymer fume fever, cases have been reported in the peer-reviewed literature of the same illness stemming from home kitchen exposures.
Teflon off-gasing studies show that at the design temperatures of conventional kitchen appliances, Teflon chemicals break apart to form the following particulates and gases:
Two chemicals linked to cancer or tumors in laboratory studies (PFOA and TFE); Two chemicals that are potent global warming gases (PFB and CF4); Two chemical warfare agents (PFIB and MFA) and a chemical analog of WWII nerve gas phosgene (COF2); At least two chemicals that have widely contaminated the world (PFOA and TFA), one currently undergoing a rigorous safety review at the Environmental Protection Agency (PFOA); Four gaseous chemicals and some components of the particulate matter that are highly persistent environmental pollutants, that likely never break down in the environment (TFA, PFOA, CF4, PFB, and the perfluorinated particulate alkanes); and four chemicals that are considered highly toxic relative to most other industrial chemicals (PFIB, MFA, COF2, HF).
Studies show that the gases that come off of non-stick pans are complex mixtures that vary in composition with temperature. At any given temperature the gas comprises one or more dominant chemicals, and other chemicals present in trace quantities. In numerous studies scientists have studied mortality in rats and birds exposed to the off-gas mixtures, but potential long-term health impacts have not been studied. The government has not conducted a safety study of Teflon cookware. Accumulation of the off-gas chemicals in food has not been studied. The potential effects to humans of inhalation exposures have not been studied, but several of the off-gas components are considered highly toxic to humans relative to most other industrial chemicals.
DuPont scientists list the hallmark human symptoms of polymer fume fever as tightness of chest, malaise, shortness of breath, headache, cough, chills, temperatures between 100 and 104°F, and sore throat, based on a survey of complaints registered by workers who were struck by the illness. Based on this suite of symptoms, cases of polymer fume fever from home exposures could easily be mistaken for the common flu. The toxic particles and gases identified as Teflon offgas products, and the temperature at which they are first identified in the studies reviewed, are shown below, with toxicity information that is drawn primarily from high dose animal studies, the only source of information available for most of the chemicals:
464°F - Ultrafine particulate matter: Teflon produces very small (ultrafine) particles which are very toxic, causing extreme lung damage to rats within 10 minutes of exposure. Longer exposures cause death. At higher temperatures, Teflon also produces toxic gases. Some scientists have found that the particles and gases together are responsible for Teflon's toxicity, perhaps because the gases adsorb to the particles, which because of their small size can lodge deep in the lower respiratory tract.
680°F - Tetrafluoroethylene (TFE): The National Toxicology Program considers tetrafluoroethylene (TFE) to be a "reasonably anticipated" human carcinogen because it is known to cause cancer in laboratory animals, but has not been adequately studied in people. In rats, inhaled TFE causes tumors of the kidney tubules, liver, blood vessels in the liver and one form of leukemia (mononuclear). Mice that breathe TFE develop tumors of the liver and tumors that develop in blood vessels in the liver or white blood cells.
680°F - Hexafluoropropene (HFP): In people, air exposure to fluorocarbons like HFP can lead to eye, nose and throat irritation; heart palpitations, irregular heart rate, headaches, light-headedness, fluid accumulation in the lung (edema) and possibly death. Long-term exposure in workers is associated with decreased motor speed, memory and learning. In mice and rats, inhalation of hexafluoropropene (HFP) causes kidney lesions, decreased numbers of a type of immune cell (lymphocyte) and increased urination. HFP also causes increased numbers of chromosomal abnormalities in hamster ovaries. HFP can also be added to pesticides as an "inert" ingredient, which does not mean that it is non-toxic, but only that is not the pesticide active ingredient. Another example of a pesticide inert ingredient is butyl benzyl phthalate, a chemical well known to cause serious birth defects of the male reproductive system in laboratory animals.
680°F - Trifluoroacetic acid (TFA): Very few studies have looked at the toxicity of trifluoroacetic acid (TFA), but those that have found decreased growth of fetal rat bone-forming cells (osteoblast) and cartilage cells (chondrocytes), and neural tube defects in rat embryos at high concentrations. Other studies show that HCFC-123, a hydrofluorocarbon that breaks down into TFA, causes enlarged liver and decreased levels of glucose, triglyceride and cholesterol in adult animals. But, it is unclear whether these effects are due to HCFC-123 or a metabolite. A monkey study found the TFA concentration in the fetus was two to six times higher than in the mother's blood following dosing with HCFC-123. The long-term environmental impacts of TFA are unknown, but it is extremely persistent and toxic to plants. TFA is also a breakdown product of many hydrochlorofluorocarbon (HCFCs) and hydrofluorocarbons (HFCs) used as replacement for chlorofluorocarbons (CFCs), which are potent ozone depleters used in refrigeration systems, aerosols and other products. Recently, scientists have suggested that high levels of TFA in the environment could be partly due to heated Teflon and other fluoropolymers because measured environmental levels are higher than predicted, based on breakdown of HCFCs and HFCs alone.
680°F - Difluoroacetic acid (DFA): Very little is known about the toxicity of difluoroacetic acid (DFA), although kidney toxicity has been reported in rats.
680°F - Monofluoroacetic acid (MFA, fluoroacetic acid or compound 1080): Monofluoroacetic acid is extremely toxic, doses as low as 0.7 to 2.1 mg/kg can kill people. Initially, people report nausea, vomiting, numbness, tingling, anxiety, muscle twitching, low blood pressure and blurred vision. If exposure is high enough, people can have irregular heart rate (ventricular fibrillation), heart attacks, and severe convulsions leading to respiratory failure. MFA quickly breaks down into a chemical called fluoroacetate. Sodium fluoroacetate was previously used as a powerful rodent killer (rodenticide). In the body, it breaks down into sodium and fluoroacetate, which is responsible for the toxicity. Sodium fluoroacetate kills rodents, and other animals, by inhibiting the tricarboxylic acid cycle which transforms energy found in food to energy the body uses. Sodium fluoroacetate also causes heart and respiratory failure, central nervous system depression and damage to the testes, including decreased sperm production.
680°F - Perfluorooctanoic acid (PFOA): Perfluorooctanoic acid (PFOA) has recently come under significant EPA scrutiny. According to Stephen L. Johnson, Assistant Administrator of EPA's Office of Prevention, Pesticides, and Toxic Substances, the EPA" will be conducting its most extensive scientific assessment ever undertaken on this type of chemical". EPA is concerned about PFOA because it never breaks down in the environment, is found in the blood of over 92 percent of Americans, and is very toxic to rats and monkeys. PFOA causes four types of tumors in rats: liver, pancreas, mammary gland (breast) and testes. PFOA also decreases thyroid hormone levels, a known risk factor for impaired brain development, and delays sexual maturation in laboratory animals. PFOA is especially toxic to the young because it kills young rats at doses that do not kill parental animals. Industry scientists estimate that it takes 4.4 years for people to eliminate just half the amount of PFOA found in their bodies. EPA is taking a close look at PFOA because levels found in the blood of people are too close to levels in rat blood that harm the animals.
878°F - Silicon tetrafluoride (SiF4): Silicon tetrafluoride is a highly toxic, corrosive gas. In the lungs, moisture causes the silicon particles to separate, releasing toxic hydrofluoric acid and also coating the lung with silicon particles. Inhaling hydrofluoric acid can cause eye and throat irritation, cough, difficult breathing, bluish skin color caused by lack of oxygen, lung damage and fluid accumulation in the lung (edema). Long term exposure can cause weight loss, decreased numbers of red and white blood cells (anemia and leukopenia), discoloration of the teeth and abnormal thickening of the bone (osteosclerosis).
887°F - Perfluoroisobutene (PFIB): Perfluoroisobutene (PFIB) is extremely toxic and inhalation can lead to fluid build up in the lung (edema), a condition that can lead to death. PFIB is listed in the Chemical Weapons Convention as a Schedule 2 compound. PFIB is about ten times more toxic than phosgene, a highly toxic corrosive gas also listed as a chemical weapon. In water, PFIB breaks down into hydrogen fluoride which is also very toxic (see below). Short-term symptoms of PFIB exposure in people include bad taste in mouth, nausea and weakness. Lung edema occurs about one to four hours after exposure, which is life-threatening in some cases, but in most people clears up in about 3 days.
932°F - Carbonyl fluoride (COF2): Breakdown of Teflon (PTFE) in air is the major source of carbonyl fluoride exposure. Carbonyl fluoride is the fluorine version of phosgene, a chlorinated chemical warfare agent. Carbonyl fluoride fumes can irritate eyes, ears and nose. More serious symptoms of exposure include chest pains, breathing difficulty, fluid accumulation in the lungs, weakness, liver damage and increased glucose levels. Because carbonyl fluoride breaks down into hydrogen fluoride and carbon dioxide, it causes many of the same toxic effects as hydrogen fluoride (see below).
932°F - Hydrogen fluoride (HF): Hydrogen fluoride (HF) is a toxic corrosive gas, and can cause death to any tissue it comes into contact with, including the lungs. The toxicity of HF is due to the fluoride ion and not the hydrogen ion. Breathing HF can cause severe lung damage, such as fluid buildup in the lungs (edema) and inflammation of lung passages (pneumonia). The fluoride ion (charged particle) is extremely toxic. It is a small ion and weak acid that diffuses quickly and can pass through tissues with relative ease. Fluoride ions inhibit cell respiration, decreasing production of ATP, the major form of chemical energy used by the body. Fluoride attacts cell membranes causing cells to die. The fluoride ion is negatively charged and naturally likes to react with positively charged ions in the body like calcium and magnesium. When fluoride and calcium bind, creating a "precipitate," a life-threatening condition of decreased calcium (hypocalcemia) can occur. Left untreated, decreases in calcium (and magnesium) can cause abnormal heart rhythm leading to heart attack, muscle spasms and death. Calcium administration is the main treatment for HF poisoning.
1112°F - Trifluoroacetic acid fluoride (CF3COF): Trifluoroacetic acid fluoride is toxic, mostly because it breaks down into hydrogen fluoride, which is very toxic, and trifluoroacetic acid. The few studies that have looked at the toxicity of TFA found decreased growth of fetal rat bone-forming cells (osteoblast) and cartilage cells (chondrocytes), and neural tube defects in rat embryos at high concentrations. Other studies show that HCFC-123, a hydrofluorocarbon that breaks down into TFA, causes enlarged liver and decreased levels of glucose, triglyceride and cholesterol in adult animals, but it is unclear whether these effects are due to HCFC-123 or a metabolite. A monkey study found TFA in the fetus was two to six times higher than in the mother's blood following dosing with HCFC-123, a hydrofluorocarbon that breaks down into TFA. Fluoride ion (charged particle) is extremely toxic. It is a small ion and weak acid that diffuses quickly and can pass through tissues with relative ease.
Fluoride ions inhibit cell respiration, decreasing production of ATP, the major form of chemical energy used by the body. Fluoride attracts cell membranes causing cells to die. The fluoride ion is negatively charged and naturally likes to react with positively charged ions in the body like calcium and magnesium. When fluoride and calcium bind, creating a "precipitate," a life-threatening condition of decreased calcium (hypocalcemia) can occur. Left untreated, decreases in calcium (and magnesium) can cause abnormal heart rhythm leading to heart attack, muscle spasms and death. Calcium administration is the main treatment for HF toxicity.
1112°F - Octafluorocyclobutane (OFCB): Octaflurocyclobutane is a fluorine-containing gas that is used in the semiconductor industry, sold as Zyron 8020 by DuPont. According to DuPont, inhaling high levels of octafluorocyclobutane can cause heart beat irregularities, unconsciousness and death. People with pre-existing heart conditions may be extra vulnerable. Only a few toxicity studies in animals are available for octafluorocyclobutane. In one study, rats exposed to a one-time-only inhaled exposure of octafluorocyclobutane lost weight and had abnormal breathing. Dogs that inhaled high concentrations (10-25% air), and were dosed with the stimulant epinephrine, had heart problems. According to DuPont, tests for genetic damage in insects are "inconclusive."
1112°F - Perfluorobutane (PFB, Trade Name CEA-410): As a global warming chemical, perfluorobutane has a long half-life in the upper atmosphere and has over 8,000 times the global warming potential of carbon dioxide. Perfluorobutane is not as acutely toxic as other PTFE off-gases, but has not been tested for long-term effects.
1202°F - Carbon tetrafluoride (CF4, perfluoromethane): In addition to being a long-lived fluorinated Teflon "off-gas," perfloromethane is used in the semiconductor industry, is a refrigerant and propellant and a byproduct of aluminum production. The U.S. government is encouraging these industries to decrease emissions of perfluoromethane because it is a potent greenhouse gas, with a global warming potential almost 6000 times higher than carbon dioxide, and can last in the environment for 50,000 years. In the past, perfluoromethane has been used in pesticides as an "inert" ingredient; a label that has nothing to do with toxicity but only means the ingredient is not the main active pesticide. Inhaling fluorinated hydrocarbons like carbon tetrafluoride can cause eye, ear and nose irritation; heart palpitations; irregular heart rate; headaches; confusion; lung irritation, tremors and occasionally coma.
In the wake of health warnings about Teflon and non-stick cookware, health-conscious consumers are increasingly seeking safer, alternative cookware products that offer non-stick cooking without the worries of Teflon. A company called Swiss Diamond, claims their pans are made of diamonds and contained no Teflon. Consumers are being fooled into buying Swiss Diamond pans based on the false impression that these pans are Teflon free and that the non-stick surface is made primarily of diamonds. This is far from the truth.
At first, the promotional literature for the Swiss Diamond pans sounds very promising. Websites selling the cookware claim, "The cookware is made with synthetic diamonds! Diamonds will heat up fast and evenly without any hot spots." Or, "This cookware line was awarded the Gold Medallion at the Inventor's Fair in
The pans are also characterized as, "One of the most durable cookware lines on the market today. Their superior non-stick coating is able to withstand the abuse of metal utensils and dishwashers."
The NextTen catalog (www.NextTen.com) specifically implies that Swiss Diamond pans contain no Teflon:
"Ordinary non-stick surfaces can't handle those high cooking temperatures. They start to break down and degrade on some stovetops. Even the EPA is studying the potential dangers in the toxic breakdown of the most famous non-stick surface. Instead, Swiss Diamond forms a virtually indestructible surface that will not crack, peel or blister..."
There's a strict avoidance of the word Teflon in all the promotional literature on Swiss Diamond cookware. Teflon isn't on the product box and, in fact, the SwissDiamond.com website insists the product contains no Teflon whatsoever! From the company's FAQ documents at http://www.swissdiamond.com/faq/faq.html
The Swiss Diamond coating does not contain any Teflon taking into consideration that “Teflon” is a trade mark, made and owned by “DUPONT.” Both the product box and the website heavily emphasize the benefits of cooking on diamonds with claims like, "Diamonds make the difference!" and "Perfect heat distribution!" The point seems to be distracting consumers from what the pan is really made of and keeping them focused on a minor ingredient: the diamonds.
The box describes it as a "nano-composite," which sounds high-tech. Plus, "diamonds" are always strongly emphasized. The impression one gets when shopping for this product is that they would be cooking on diamonds, and that whatever the nano-composite was made of, it would certainly be safer than Teflon.
When asking the Swiss Diamond company for an explanation of what the nano-composite material is made of, you are told that, "Our patented nonstick surface uses a nano-composite of real diamond crystals and PTFE; it is applied using a computer controlled plasma gun at very high temperatures."
What was PTFE? Polytetrafluoroethylene (PTFE) is a fluoropolymer discovered by Roy J. Plunkett (19101994) of DuPont in 1938. It was introduced as a commercial product in 1946 and is generally known to the public by DuPont's brand name Teflon.
If you look back at the Swiss Diamond website screen capture, the careful wording of their answer now becomes clear. It states, "The Swiss Diamond coating does not contain any Teflon taking into consideration that “Teflon” is a trade mark, made and owned by DUPONT." So the pans don't contain Teflon, they just contain the chemical called Teflon. It's like saying a nuclear warhead doesn't contain any plutonium, it only contains nuclear fissionable material.
For the manufacturer to insist the Swiss Diamond pans contain no Teflon whatsoever when it is made primarily from polytetrafluoroethylene, the chemical widely known as Teflon, is extremely deceptive. In fact, the intent of the Swiss Diamond company seems to be to deceive consumers by omission of the facts. The FAQ document on the Swiss Diamond website does not bother to say something like, "But our pans do contain PTFE, the chemical known as Teflon." It simply insists they contain no Teflon and moves on to the next question.
It seems that Swiss Diamond goes out of its way to give the impression that this product is free of Teflon chemicals and is surfaced primarily with diamonds. The company's marketing materials specifically attempt to distance the company from Teflon even though its own pans are made with precisely the same chemicals.
The Swiss Diamond company also makes utterly outrageous and false claims concerning the durability of its pans. We all know that diamonds are extremely durable, right? The Swiss Diamond company plays on this common knowledge by associating the diamond content of their non-stick cooking surface with the idea that their pans are "indestructible."
The Swiss Diamond pan box proudly proclaims, "Diamonds make the difference!" and that the pan is, "Virtually indestructible." That's quite an impressive claim. It also claims to provide, "Perfect heat distribution." Adding to the claims, text on the side of the box also claims that, "Diamond crystals form an indestructible non-stick cooking surface that will not crack, blister or peel."
But, the surface of the Swiss Diamond pan have been quite easily scratched with a common household fork. This was done with a regular household fork. It didn't take any special effort or power tools. The non-stick "diamond nano-composite" surface hardly seems indestructible, doesn't it? Indestructible would include not being harmed by a simple fork scratch. Clearly, the Swiss Diamond cooking surface is quite destructible. If it can be damaged with a fork, it will quite obviously be just as easily damaged by metal cooking utensils. And it makes you wonder: if a fork can scratch the pan so easily, at room temperature, how vulnerable is the pan to scratching by metal utensils at high temperature?
Using a 200x video microscope, the surface of the pan was examined after scratching it with a fork. At this magnification, it looked like an airliner crashed there, you clearly see bits and pieces of the non-stick surface that have been scratched away from the surface by the fork test, you can clearly see the width and length of one of the fork scratches. It is certainly not anything close to "indestructible," or else there would be no scratch at all.
What's important to note here is that this is what you are eating when you cook food on any Teflon surface that gets scratched. This is how these PTFE chemicals ("Teflon" by the DuPont name) get into your bodythey are scratched off the pan with cooking utensils, then blended into the foods that you later swallow.
These chunks of PTFE are jagged, scary-looking chunks of synthetic chemicals that have no place in the human body. You really don’t want to eat this. Imagine what a metal spatula might do after scrambling eggs, flipping burgers or stir-frying some vegetables.
The only healthy surfaces to cook on are cast iron, and Pyrex glass (but Pyrex glass needs a flame deflector for gas stovetop use).
For more information and video evidence go to: http://www.newstarget.com/021059.html