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Blue Verditer

It is generally stated to be made by adding chalk to a solution of nitrate of copper produced in the process of refining silver; but Mr. Phillips did not succeed in making it by this means, and found no lime in the best samples. This pigment is acted upon by suphurretted hydrogen; it should not be used in oil, and though more stable in water, it is hardly a pigment for high art work. Certain blues are made from the natural blue basic carbonate of copper, and from malachite, but they have no interest for the artist.