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To Detect Cotton in Linen (Unravel a piece of the fabric)

Unravel a piece of the fabric, both warp and weft, and plunge it into a solution of aniline and fuchsine. This will dye the whole red.

Take it out, wash it, and while moist dip into ammonia; the cotton threads will lose their color, while the linen will remain red. (See No 296, &c.) grey precipitate.

If the wine is artificially colored, potash gives the following colored precipitates:

Dwarf elder, mulberry, or beet root give a viclet precipitato; pokeweed berries, a yellow; Indian wood, a vlolet red; pernambuco, a red; litmus, a violet blue; orchil or cudbear, a dirty lees color.

Or: Pour into the wine to be tested a solution of alum, and precipitate the alumina it 4402. Hahnemann's Test for Lead in contains, by adding potash, and the precipi- Wine. Take 1 ounce quick-lime, 14 ounces tates will have the same characteristic colors flowers of sulphur; heat in a covered crucible as above. for 5 or 6 minutes; take 2 drachms of this