I don't know about bisque....might call the people that fired the piece and ask if it's possible. Might be some chemical or mixture that would take it off.

I think the paint would soak down into the porous surface and have stained it permanently.

I received two private e-mails telling me to refire & that the paint would come right off. The people that wrote said this is what they've done before.

I tried soaking them in water to see if the paint would just bubble up & peel right off, like on terra cotta, but not so. But then again, the paint didn't soak in because I was able to scratch some off. It's just too much work to scrub for hours to remove the paint.

Yet, it's probably too expensive to refire the items just to resell them for pennies.

Sigh.