Colorant
A material that transforms a glossy or white glaze into a colored glaze. Colorants can be raw metal oxides (e.g. iron oxide, chrome oxide) or smelted (e.g. stains). Potters and smaller companies often use raw colorants whereas industry employs stains. Unlike stains which are prefired, the color of a raw powder colorant likely bears no resemblance to the color it will produce in a glaze. In ceramics, color is a matter of chemistry. The color produced depends on the chemistry of the host glaze and of the mix of colorants added. The same metal oxide can participate in many color systems. Some colorants produce the same color across a wide range of host glazes (cobalt), others are very sensitive to the presence or absence of specific helper or hostile oxides (chrome-tin). Colors are the most vibrant in transparent glazes where there is depth. In opaque glazes colorants tend to produce pastel shades. Some colors are potent, 1% can produce a strong color. Others are weak and 10% make be needed. Out Bound Links
In Bound Links
Pictures
Example of three different colors of iron oxide pigments
Alberta Slip GA6C recipe on right (normal) and on left where a Boraq has been used as the flux instead of Ferro Frit 3134. The MgO is destroying the effect!
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