organic acid

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An organic acid, obtained by oxidizing many organic substances, and found in the red ant.

Chemically, carmine is a compound of carminic acid with alumina, lime and some organic acid.

The air dissolves at the same time a certain amount of organic acid and resinous products which the hide has absorbed.

By further exposure to air the organic acid is oxidized to carbonic acid, and hydrated oxide of iron remains.

But most of the natural gums yield a mixture of galactose, some pentose, and some complex organic acid.

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