The capsule itself is composed of titanium dioxide, indigotin, erythrosine and gelatin. |
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In 15 samples, carminic acid was found in combination with indigotin. |
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The action of ammonia in urine converts indigotin into soluble 'white indigo,' which is actually greenish-yellow. |
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Indigotin was used in conjunction with other dyes to produce several purples and a green. |
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