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2241. Blacking. Blacking is generally made with ivory black, treacle, linseed, or sweet oil, and oil of vitriol. The proportions vary in the different directions, and a variable quantity of water is added, as paste or liquid blacking is required; the mode of making being otherwise precisely the same. 2242. Liquid Blacking. Ivory black and treacle, of each, one pound; sweet oil and oil of vitriol, of each, a quarter of a pound. Put the first three together until the oil is perfectly mixed or "killed;" then add the oil of vitriol, diluted with three times its weight of water, and after standing three hours add one quart of water or sour beer. The ivory black must be very finely ground for liquid blacking, otherwise it settles rapidly. The oil of vitriol is powerfully corrosive when undiluted, but uniting with the lime of the ivory black, it is partly neutralized, and does not injure the leather, whilst it much improves the quality of the blacking. 2243. Paste Blacking. Ivory black, two pounds; treacle, one pound; olive oil and oil of vitriol, of each, a quarter of a pound. Mix as before, adding only sufficient water to form into a paste. 2244. Best Blacking for Boots and Shoes. Ivory black, one ounce and a half; treacle, one ounce and a half; sperm oil, three drachms; strong oil of vitriol, three drachms; common vinegar, half a pint. Mix the ivory black, treacle, and vinegar together, then mix the sperm oil and oil of vitriol separately, and add them to the other mixture.