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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Blue Purple
100 pounds wool are first dipped a light blue in the vat, and | well rinsed. Then take a stone pot, put in 3 pounds tartar, 3 pounds feathered tin , 5 pounds blue vitriol, and 20 pounds muriatic acid; heat all in a sand bath until dissolved.
From this mordant take 10 pounds in a suitable kettle; add 5 pounds tartar to it, stir it well, and enter the wool at 170° Fahr.; let it and then work for 1 hour in another bath with 4 pounds logwood, 4 ounces barwood, and 4 ounces fustic; lift, and add 4 ounces copperas in solution; work half an hour in this , and then wash and dry. In order to dye a blue black, the goods must be first dyed blue by the vat (see No. 130) or otherwise, and then proceeded with as for black, only using less mausing less materials.