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As the coloring-matter of archil is not precipitated by baryta and magnesia, but changed to a purple, the baryta method, recommended by Pasteur, Balard, and Wurtz, and the magnesia test, are useless. Magenta may in course of time be removed by the precipitates formed in the wine. It is therefore necessary to test not merely the clear liquid, but the sediment, if any. Dr.
SILK DYES. Silk is usually dyed red with cochineal, or carthamus, and sometimes with Brazil wood. Archil is employed to give silk a bloom, but it is seldom used by itself, unless when the colour wanted is lilac. Silk may be dyed crimson, by steeping it in a solution of alum, and then dyeing it in the usual way in a cochineal bath.
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