(Noun) In discussing pottery and porcelain condition a crack is defined as "a narrow break going through glaze and porcelain body, visibly from both sides".
A distinction must be made if the damage is stable or not.
In some older pottery cracks can occur on one side only of the porcelain / stoneware wall. This could either be a large meshed crackle or a damage and should be mentioned anyway from the point of what might have caused the crack i.e. stress, age, firing, burial, internal tension etc. See also crackle and break