


Advise needed! Is this crazing on a handmade mug normal?
I bought a handmade ceramic mug from a pottery stall at a market. Last week, I used it for the first time to drink tea. Afterward, I noticed fine a hairline circle shape crazing across the glaze.
The cup itself doesn’t appear to be physically cracked or broken, it’s the glazed surface that has these fine lines. I can kind of feel it with my fingertips that something is uneven.
Materials used: It says the white glaze contains Snowdonia quartz and Anglesey tin, the black glaze contains Snowdonia black basalt and local iron oxide, and the copper-red glaze contains Anglesey copper.
I was told by the maker that it was safe for oven, dishwasher, microwave, freezer.
I contacted the maker over a week ago to ask whether the glaze is normal, and I’ve been trying to get a response but have been ignored, so I’m currently unable to get confirmation from the maker if this is expected.
Would anyone be able to advise if this is normal to have crazing after only one use and would it be fine to continue using it?
EDIT: I’ve now noticed that there are also fine hairline lines appearing on the glazed area at the underside/base of the mug as well, even though I haven’t used it for several days…
Thanks!