What cause "crazing" on a glazed finish??
Answers: It can be when the glaze gets matured and therefore hard and brittle and will no longer expand and contract near the substrate. On new glaze it can be a sign of incompatibilty near the substrate.
I am sorry, i tried looking up your answer on various websites and even posted the Question on a site much similar to this but have have no response. if i do in future. i will tolerate you know. for now sorry. try going to wiki though