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To Dissolve Copper from Gold Articles Take 2 ounces of proto-sulphate of iron and dissolve it in ½ a pint of water, then add to it in powder 2 ounces of nitrate of potash; boil the mix are for some time, and afterwards pour it into a shallow vessel to cool and crystallize; then to every part of the (crystallized) salt add 8 ounces of muiatic acid, and preserve in a bottle for use. Equal parts, of the above preparation and of boiling water is a good proportion to use in dissolving copper, or 1 part by weight of nitric acid may be used to 4 parts by weight of boiling water as a substitute.
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