IN a recent communication 1, I described a new colour reaction for the antithyroid drugs, 2-thiouracil and 4-methyl-2-thiouracil. This is based upon the yellow colour which is given when small ...

While making a comparative study of the colour reaction of steroids and triterpenes, we have found a hitherto undescribed reaction produced by the D vitamins, producing a clear and limpid blue colour ...

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