Thanks Penny,mudlarkpottery wrote:Manganese in clay bodies tends to bloat in a reduction firing as well as posible health problems if you are not careful mixing glazes. For those of you just starting with clay work, clay is carcinogenic. So keep your work area as free of dust as possible. It's effect is the same as asbestosis (wrong spelling) and used to be called "Potter's Lung". If the lead glaze didn't get you, the dust would.
Penny.
These are some very good points.
Safety is always at the top of the list when working with clay and glazes.
Cheers,
Paul