None of our tile colours are guaranteed against crazing, and equally we cannot say that any particular tile colour will exhibit this effect.But over an extended tile period many of our tiles tend to craze, especially the high gloss colours that are translucent.
This is slight cracking in the glaze is normal, and is usually caused by the small expansion of the tile body when wet. This is usually most apparent when the tiles are first laid, or after "slabbing". However it usually occurs to some degree with time. The commonest cause is expansion of the tile body due to moisture ingress, which produces these tensile cracks in the glaze.
It does not affect the serviceability of the tile - the cracks are in the glaze only and not the body of the tile, and may lessen when the tile fully dries out .
The thickness of the glaze necessary to reproduce the high gloss glazes also leads to increased likelihood of crazing, so crazing is very likely to occur in most of our glaze colours. The Ivory, Bassalt black, Stockwell grey, 942 and burgundy glaze colours are less likely to show crazing effects, due to the different nature of the glaze formulation.