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To Detect Cotton in Silk or Wool

Take a small piece and unravel the threads, 291. Black on Cotton, Silk and Wool, by one Process. Steep for 6 hours in 2 pounds sumach; then work for an hour in a solution of 6 ounces tartar, 6 ounces sulphate of copper, and 6 ounces copperas; wash out, and inflame them; the cotton burns away and then work for half an hour in a decoction freely and leaves little or no black charcoal; of 4 pounds logwood; lift, and add 1 ounce the wool and silk shrivel up, leave a black copperas; work for 10 minutes, wash and dry.