Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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Chrome Blue
100 pounds of wood and 1 pound fustic; lift, and add 2 for an hour in a decoction of 5 pounds logfor an hour in a decoction of 5 pounds logwool are boiled for one hour in a solution of ounces copperas, and work 10 minutes; wash 3 pounds bichromate of potash, 6 pounds and finish. If the color is not deep enough, alum, 1 pound half-refined tartar; then it is add a little more logwood before lifting. taken out, cooled, and rinsed. Boil 6 pounds good logwood in a bag for half an hour in in a solution of 1 pound copperas and 4 fresh water, add 3 pounds cudbear, well ounces alum; wash out well, then work for moistened and dissolved. Cool the dye to an hour in a decoction of 4 pounds legwood. 180 Fahr. Enter the prepared wool, and with a little white soap added; wash out and 'handle it for of an hour; bring it to a boil finish. in this time.
This color ought to be always left a shade lighter when finished, as all a deep Prussian blue according to receipt