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Yes, they are good to use. Remember even bisque firing pottery without
glaze has harmful gases
emitted into the air.
The best advice is have the kiln outside the building period.
I do not allow any girl who is pregnant to touch any glazes at all. They
must have a friend glaze the pots for them.
No exceptions. Also if they are still nursing the baby . No glazing allowed.
Madera High School