6), melts at 180-181°C. The simple oxypyrimidines are obtained by the action of nitrous acid on the amino derivatives, or by heating these latter with concentrated hydrochloric acid to 180° C. They show both basic and phenolic properties and are indifferent to the action of reducing agents. [Please select]
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This is also an acid or phenolic dye, as a glance at its formula will show you. [Please select]
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The oxidation is probably due to an enzyme, and also to the presence of chemical substances of a phenolic nature. [Please select]
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Just such peculiar _quasi_-acid, or phenolic substances are Alizarin, and most of the natural adjective dyestuffs, the colouring principles of logwood, cochineal, Persian berries, etc. [Please select]
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The first group imparts phenolic characters, while the second gives true acid properties, and both of these acting together cause the dyes to be able to form colour lakes with metallic oxides. [Please select]
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