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Are colored porcelains hazardous?
Colored porcelains are pigmented by ceramic stains, stains are largely insoluble and thus pose little threat on skin contact. Encapsulated stains must not be ball-milled for glazes (to lessen particle surface area and prevent access to the metals inside the zircon crystals), this would of course apply to clay bodies also. Black porcelains would have 5-7% stain, blues less. But reds and yellows would need a much higher percentage. Stains are very expensive, it is likely that you will not be able to afford enough stained porcelain to pose a significant threat from its use. The main health concern in ceramics is still quartz dust, both by its nature and by the fact that most glazes, bodies, engobes, and slips contain a significant percentage. Stains should be treated the same way, not allowed to accumulate as dust on surfaces, not allowed to get into the air in working areas and used in ventilated areas.
| By Tony Hansen Follow me on         |  |
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Ceramic Stain
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