•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com
Kaolin has a TLV (threshold limit value) of 2.0 milligrams per cubic meter of air breathed. By comparison iron oxide is considered a safe-to-use material at 5.0, tin oxide is 2.0, barium carbonate is 0.5, quartz is 0.1-0.05.
Some books cite the presence of some free silica in kaolin as a silicosis hazard; however, other sources and regulatory bodies recognize no known hazards and consider it a nuisance dust. Unlike ball clay, kaolin normally only contains small amounts of quartz (e.g. 1%).
Like many clays, data sheets often caution against slipping on a slippery aqueous suspension if it gets spilled on the floor!
ALLERGIES: It isn't possible to be allergic to an inert mineral like clay. However, molds, mildews, and other organisms that can make their home in clay, along with their byproducts, can cause a problem.
In Bound Links
By Tony Hansen