Satin white

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An unstandardized term that has been used for gypsum. Recently, the term satin white has been used for a bulky, opaque, white paper filling material. This filler, also called calcium sulfoaluminate, is made by the reaction of aluminum sulfate, hydrated lime and potash alum.

Other Properties

Particle size = about 1.5 x 0.15 (elongated crystals)

Refractive Index 1.46

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