These pigments give color stability at stoneware temperatures in reduction and oxidation. Cadmium and Selenium particles are combined with Zirconium to stabilize them against dissolution into the melt. Reds and orange hues which are very difficult to achieve in reduction are now possible. These stains are very expensive and must be used according to instructions.
The simple answer is that you should not. The chemistry of stains is proprietary. Stain particles do not dissolve into the glaze melt like other materials, they suspend in the transparent glass to color it. That is why stains are color stable and dependable. In addition, their percentage in the recipe, not the formula, is the predictor of their effect on the fired glaze. Of course they do impose effects on the thermal expansion, melt fluidity, etc., but these must be rationalized by experience and testing. But you can still enter stains into Insight recipes. Consider adding the stains you use to your private materials database (for costing purposes for example).
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