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12It will be proper to explain in what manner white lead is made, and also verdigrease, which we call æruca. The Rhodians place, in the bottoms of large vessels, a layer of twigs, over which they pour vinegar, and on the twigs they lay masses of lead. The vessels are covered, to prevent evaporation; and when, after a certain time, they are opened, the masses are found changed into white lead. In the same way they make verdigrease, which is called æruca, by means of plates of copper.
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