Goods. First dye the woolen according to No. 192; then, after steeping the goods in sumach, dye the cotton by receipt No. 139.

289. Brown on Cotton and "Woolen Goods by one Process

289.    Brown on Cotton and "Woolen Goods by one Process. Work for 2 hours in catechu, as in No. 147; then work at a boiling heat for an hour with 8 ounces bichromate of potassa and 2 ounces tartar; next work for an hour in 2 pounds fustic and 8 ounces cudbear ; wash and dry. For a deeper shade, or of a more chocolate hue, add 4 ounces logwood to the cudbear.

290. Black on Silk and Woolens by-one Process

290.    Black on Silk and Woolens by-one Process. "Work for an hour in a solution of 8 ounces tartar and 8 ounces copperas; wash out, then work for 15 minutes in a decoction of 4 pounds logwood; lift, and add 1 ounce chrome; work for 30 minutes and dry.

291. Black on Cotton, Silk and Wool, by one Process

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 then work for half an hour in a decoction of 4 pounds logwood; lift, and add 1 ounce copperas; work for 10 minutes, wash and dry.

292. Deep Black

292.    Deep Black. To obtain a very deep black, add 1 pound of bark to the logwood, and proceed as in last receipt.

293. Drabs on Cotton, Silk and Wool, by one Process

293.    Drabs on Cotton, Silk and Wool, by one Process. Work for half an hour in 8 ounces copperas and 4 ounces tartar; lift and drain; then work for half an hour in 4 ounces logwood and 1 ounce bichromate of potassa; wash out and dry. By varying the quantity of logwood, and by introducing a little fustic or peach wood in combination with the logwood, a great variety of drabs, slates or fawns can be produced.

These few receipts for mixed fabrics will show the care required in such operations, although, by practice, they become comparatively simple.

294. To Detect Animal or Vegetable Fibres

294.    To Detect Animal or Vegetable Fibres. Treat the fabric with bichloride of tin heated to from 130° to 150° Fahr., when the cotton and linen become black, and the wool and silk remain unchanged.

295. To Detect Mixed Fabrics of Cotton and Wool

295.    To Detect Mixed Fabrics of Cotton and Wool. Dip a piece of the cloth in bleaching liquor; after a little while the woolen turns yellow, and the cotton white, and may easily be distinguished.

296. To Detect Cotton in Linen

296.    To Detect Cotton in Linen. The piece to be tested should be boiled to remove all dressing, and then dried; put a portion of the piece into common vitriol for about one minute; take it out and wash it in water several times, and then into a weak solution of soda or potash, and all the gummy matter formed is removed by gentle rubbing. By this process the cotton is dissolved and the linen remains, or any portion of the cotton that is not dissolved becomes opaque white, while the linen is transparent. By comparing the portion thus tested, with a similar portion not tried, the quantity of cotton present can easily be estimated.