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Blue Black by Prussiate

Dye chrome colors darken in drying.

In the foregoing receipts, the quantity of half an hour, in 8 ounces copperas; wash well No. 131, and work, from the prussiate, for water to be used is not material, but will be out in cold water, and then work for half an regulated according to the size of the vessel hour in a decoction of 2 pounds logwood. lift, and add a little of the copperas solution first used, then work for 10 minutes more; wash and dry. steep for several hours well under the liquor; wash out well in cold water. If the shade is not blue enough, add to the water a little cochineal dissolved in ammonia; work in it for 10 minutes, wring out and dry.