What can cause the color or appearance of a ceramic color standard to change?
If color standards are handled or stored improperly, short-term reversible color changes can occur. For example, if the user doesn’t wear clean, lint-free gloves, color standards can become soiled in a single work session. If the optical surfaces are not damaged, soiling usually can be removed by careful cleaning. Ceramic glazes are subject to scratching and chemical etching. Color standards that have been physically damaged cannot be restored.
