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How acid and alkali stable are Shepherd Color pigments?

acid alkali Pigments shepherd color STABLE
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How acid and alkali stable are Shepherd Color pigments?

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All but three Shepherd Color pigments are stable in highly acidic or basic solutions. Our Violet 11 is not stable in alkali or basic solutions (pH over 7). Our Violet 92 is not stable in acidic (pH under 7) solutions. Violet 102 is not stable in any aqueous solutions.

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