Be Aware of Poisons in Pottery

Creating pottery is fulfilling, but it can also be dangerous. Many of the materials used to produce those beautiful works of art are, unfortunately, poisonous. They are most dangerous in their raw form, but some can present a hazard even after the pottery is fired.

Some of the most dangerous substances found in pottery include:

Asbestos – This is a substance that was once commonly found in building materials, but has become tightly regulated in recent years. It can cause lung diseases such as mesothelioma in those who are exposed to it regularly.

Cadmium – This substance is used in glazes. It can cause a variety of ailments, including respiratory problems, osteoporosis and cancer.

Carbon monoxide – This is a by-product of combustion that can form during reduction firings. When breathed in, it reduces the amount of oxygen available in the body. Exposure can cause death in a short period of time.

Lead – Lead can be stored in the bones for years, eventually building up to a fatal dose. It can also cause a laundry list of health problems and is especially harmful to children.

Iron and Ferrous Sulfite – These substances are used as colorants in various pottery materials. Overexposure to iron can cause acute illness which may include vomiting, diarrhea and shock, especially in children. Ferrous sulfite is much more dangerous than other forms of iron, and exposure to it can be fatal.

Potassium dichromate or bichromate – These substances can cause cancer and kidney failure.

Silica dust – This is found in potter’s clay. If inhaled repeatedly, it can cause lung irritation or silicosis, which may be fatal.

Uranium compounds – Uranium is a radioactive element that should be avoided. Exposure can cause kidney damage and other health problems.

Protecting Yourself and Others

By taking the proper precautions, it is possible to greatly reduce your risk of illness from exposure to pottery materials. But it’s also a potter’s responsibility to protect those who enter his workspace or use his pottery. Here are some safety measures to live by:

• Wear masks when needed. If you’re handling dry materials that contain dust, put on a dust mask. When reducing or salt or soda firing, wear a gas mask. You should also wear a mask when spraying glazes.
• Use caution when handling raw materials. Wear gloves whether they are wet or dry. Some toxic substances can be absorbed through the skin.
• Wash frequently when working with pottery. Do not allow materials to remain in contact with your skin.
• Make sure your studio is properly ventilated. This is especially important when using a kiln, but good ventilation is always essential.
• Keep all pottery materials out of the reach of children. Put them on a tall shelf or lock them up in a cabinet when not in use.
• Avoid using any material that may leach out in ware that could be used for food or drink. Label any pieces that you sell or give away that contain toxic substances.

Poisonous substances are found in many art and craft supplies, but they are particularly prevalent in pottery materials. Using caution when working with materials containing hazardous chemicals can reduce your risk of illness.