To Dye Black Satinet, Muslin de Laine, And other Goods which have a Woollen Weft and Cotton Warp.

Scientific American 23, 23.2.1850

Dye the woollen part first by preparing the wool with the sulphate of iron, about 3 oz. to the pound of wool and a small quantity of the sulphate of copper. At this ratio of iron preparation the woollen goods should be boiled in a suitable quantity of water fro three-fourths of an hour. If the goods are in pieces they have to be kept continually turning on what is termed a winch. After this boiling they are taken out, dried, and dripped. They are then dyed with logwood, at the rate of three pounds to ten pounds of goods. The boiling should be continued one hour at least. They are then to be taken out and well washed, and then left to steep for eight hours in cold weak sumac. They are then to get a dye of what is termed the cotton process; viz., first handled in weak cold limewater, then taken out, dipped, and run through a solution of copperas, then dripped, well washed and afterward run through (not very strong) a solution of logwood. All they want now is to be washed and dried. This dyes both the wool and cotton. As wool is all animal and cotton a vegetable production, the processes to dye them are entirely different, and this is the reason why so many fail to dye a black upon such kinds of goods. No hot sumac should be used, or else the wool will become very brownish in color.

Ei kommentteja :