jamit
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Chemically removing colored dyes
I just received some ammonium phosphate for crystal growing but it is colored with dye- my guess is that it's food coloring.
I want to remove the color dye and crystallize out the ammonium phosphate. I looked up on google and someone suggested using magnesium chloride but I
don't know if it will work and I don't have this chemical.
I was thinking of using some cheap and readily available chemical that will absorb just the color dye but not reaction with the ammonium phosphate,
such as, diatomaceous earth or maybe activated charcoal? Do you think this would work? Any suggestions?
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Chemosynthesis
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I would definitely try a little bit stirred with activated charcoal. What color dye?
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jamit
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I have three different colored ammonium phosphate crystal growing packages -- red, green, orange. I'd tried recrystallization but the dyes
crystallizes out with the ammonium phosphate so there's no way to remove it by recrystallization.
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Zyklon-A
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Just make sure not to do anything to the whole batch. If you test any color removing procedures, try first on a few grams, if it works, then do the
whole thing.
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forgottenpassword
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Yes, use decolourising carbon and filter whilst hot.
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blogfast25
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Try hydrogen peroxide. Organic dyes may be prone to oxidation.
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