Is oil painting toxic？ Many people think that oil paintings are “bad for you”, but why? Because oil paintings are made from mineral pigments and solvents, the chemical names of which are not familiar to us. In fact, as long as we know which ingredients are truly hazardous, ventilate the studio well, use purifiers, and opt for low-toxicity alternatives, we can paint every picture with confidence.
What are the toxic elements in oil paints?
What are the toxic elements contained in oil paints?
Traditional oil paint formulas contain some amount of soluble heavy metal compounds. To be precise, some soluble heavy metal elements are involved in the development of color in the pigment.
Soluble heavy metal elements like lead are common in lead white; lead and barium, two heavy metal elements, are found in chrome yellow and barium white in the past; there is also a combination of lead, barium and chromium, which can produce that opaque yellow-green color in the early days; in the more complicated traditional formulas, there are even lead, barium, chromium, antimony, cadmium or barium, chromium, antimony, cadmium and mercury, which are still found in military markings and industrial coatings These; and highly toxic complexes of chromium, antimony, cadmium, mercury, and arsenic, which are rare but have to be watched out for.
Additionally, ultramarine and Prussian blue, although less toxic, may be contaminated with cobalt-based compounds used as desiccants. For some individuals, cobalt can also cause skin sensitization.
What are the effects of heavy metals on the human body?
If we accidentally ingest these heavy elements, lead interferes with neurotransmitters, cadmium accumulates in the kidneys, hexavalent chromium is a known carcinogen, mercury affects the central nervous system, and arsenic can cause keratinization of the skin. Although oil paints are in paste form and produce less dust than pastels, there is still a risk if you accidentally ingest them or grind dried paint film.
How can I distinguish between toxic and non-toxic oil paints?
- Check the ASTM D-4236 label.
- Look for the “AP” mark and avoid colors marked “CL” or with skulls.
- Use organic synthetic pigments instead of heavy metals, such as benzimidazolone yellow instead of chrome yellow.
Selection criteria for non-toxic diluent solvents
What makes a good diluent?
“Non-toxic” does not mean that there is no risk at all, but rather that it has a very low content of volatile organic compounds (VOCs), virtually no aromatic hydrocarbons, a high flash point, and has been evaluated toxicologically and determined to have no appreciable risk to the health of adults. Odorless mineral oil (OMS) falls into this category.
What are some common good diluents?
- Gamsol: contains less than 0.01% aromatic hydrocarbons, has a flash point of 65°C, and has almost no odor.
- Sansodor: It is turpentine from Windsor Newton, less irritating than traditional turpentine, you can choose this better turpentine.
- Limonene-based solvent: it’s derived from citrus peels and has a fresh scent, but be aware that it may cause sensitivity to light in some individuals.
- Water-soluble oil thinner: It is specially formulated for mixing oil with water and can be re-diluted and brushed with water, dissolving exceptionally well.
How to use thinner for safety?
- For early thinning, the ratio of mineral oil to pigment is 1:1.
- Use less than 10 ml at a time and close the lid when finished.
- After the cured residue has settled, it is disposed of as hazardous waste to prevent spontaneous combustion at high temperatures.
Measures to stay safe in the studio
How can I keep my studio well ventilated?
You can open the windows on the diagonal of the studio and put a small fan to keep the air moving. If it is not convenient to open the windows in winter, consider installing an exhaust fan and connecting an activated carbon duct.
What is the need for an air purifier?
An air purifier equipped with a VOC sensor and an activated carbon cartridge of 800 g or more can reduce VOC concentration in the room by half in 30 minutes, making it particularly suitable for use in an apartment studio.
How should painters protect their skin?
Wear nitrile gloves and long-sleeved clothing when painting to protect yourself from potential hazards. Paint-stained clothes should be moistened with water and sealed to prevent spontaneous combustion. When sanding dry film or spraying varnish, wear a filter mask again.
Odors and Volatility of Oil Paint
What is the source of oil paint odors?
During the slow drying of oil paints in the studio, a small amount of aldehydes is produced by the oxidation of linseed oil, and the solvent evaporates, giving off an alkanic smell.
What are the health effects of volatile components?
Short-term exposure to high concentrations of volatile ingredients can cause dizziness and discomfort in the throat; long-term exposure to low doses may lead to mild nervousness.
How to deal with the odor of oil paints?
- Use an OMS with a low odor.
- After painting, ventilate for 10 minutes with strong exhaust.
- Put an activated charcoal packet in the area where you mix the colors to absorb the smell.
Risks of ingesting oil paints
How can I avoid accidentally ingesting oil paints?
Keep eating areas separate from painting areas. Don’t keep brushes in your mouth. Also, keep children and pets away from paints.
What are the symptoms of accidental ingestion of heavy metals?
Acute symptoms are vomiting, a metallic taste in the mouth, and stomach pain; chronic symptoms are fingernails turning blue and black, joint pain, and easy fatigue.
What should I do if I accidentally ingest it?
You should take the label of the pigment tube to the doctor, and never attempt to induce vomiting yourself; the doctor will perform a chelation treatment.
Is oil painting toxic? Common Myths and Safe Painting Knowledge
What are common misconceptions about oil paints?
- “Oil paint must be more toxic than acrylic” – in fact, fluorescent acrylics may also contain formaldehyde releasers.
- “Odorless OMS is absolutely safe” – still need to pay attention to ventilation and fire prevention.
- “You can swallow it if it has the AP logo” – this does not mean you can eat it.
How to Use and Store Oil Paints Properly?
Squeeze a little paint at a time, replenish when needed, and keep the mouth of the tube clean. Maintain a room temperature of 15-25℃ and a humidity level of 50% to slow down the yellowing process.
What safety precautions should I take during the painting process?
- The palette knife should be scraped clean every time you change colors.
- Wear a mask when handling flax-cured paint chips.
- Make it a good habit to clean your brushes and painting materials after each painting session.
