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To dye wool a permanent blue colour

Take four ounces of the best indigo, reduce it to a very fine powder, and add twelve pounds of wool in the grease; put the whole into a copper large enough to contain all the wool to be dyed. As soon as the requisite colour is obtained, let the wool be well washed and dried. The liquor remaining may be again used, to produce lighter blues. The colour will be as beautiful and permanent as the finest blue, produced, by woad, and the wool, by this method will loose less in weight than if it had been previously scoured.