hairline cracks

[ssbill]

Should an hairline crack be visible on both side of a porcelain dish?
I have a plate with a very small 3mm crack on the rim but only visible on front side. There is no crack on the back side of the dish. Is it a hairline or a glaze line? Thanks

[peterp]

A glaze line exists only in the glaze, not the porcelain body. A hairline crack is a very narrow, tight crack than can be both in either the clay body, the glaze, or both. Thus, a glaze line is usually also a hairline crack.