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Invisible hairlines on a white body, or some types of crazing on matt white pieces, will miraculously appear as a grey line as the water seeps into the crack and temporarily darkens the ceramic body If you have a fruit bowl with stains or discoloration inside, they may well bleach-out if you stand the piece in full sunlight in a window during summer for a few weeks.
But make sure it can stand the heat, and that it doesn't have decoration that will fade Ceramics (= pottery) describes anything made from a non-metallic mineral, usually clay, that has been fired.
Indoors is fine, and use a room with good natural light and big windows.
Summer is best and even a cloudy day will give a short exposure, good contrast and nice colour balance.
Crazing is a curse of ceramics colletors and indicates that the factory did not bother to adjust the thermal expansion coefficient of the glaze to fit that of the body. Decoration Decoration may be underglaze, in which case it is dishwasher proof.
Crazing lines can harbour bacteria, so crazed pieces should not be used in the kitchen or on the dining table. However, underglaze decoration is limited in scope because the colours have to be resistant to the heat of firing.
Other e Bay fetishes are to photograph the object on an unmade bed (were the sheets clean?
To overcome this problem, an overall glaze can be used, in which case the piece has to be supported on a pointed tripod in the kiln, leaving three scars on the underside.
Earthenware can craze, meaning that the glaze shrinks at a different rate from the body, causing the glaze to develop a network of fine cracks (crazing, craqueleure) due to the stress.
Earthenware items usually have an unglazed foot rim, so that the object doesn't stick to the kiln shelf.
This unglazed area can absorb liquids or grease during daily use, leaving a stain in the body.