Encyclopedia of Practical Receipts and Processes

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Tests for Carbonic Acid

It reddens litmus paper, extinguishes the flame of a burning taper, and forms a white precipitate in aqueous solutions of lime and baryta, which is soluble in acetic acid. By together, a precipitate will form of tannates; the last test, a very small quantity of this also, if the preparation of opium contain gas may be easily detected in the atmosphere saffron, as in acetum opii and Sydenham's laudanum, this will cause a further precipitation of the extractive of saffron. (See No. 3908.)

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