after which it is carefully washed senious acid is now used as a bath into which the cleansed iron is dipped and kept until a coating of lead and arsenic forms on the entire surface. The iron is now lifted out and dipped into a bath of mol ten lead or an alloy composed of lead and a very small proportion of copper. In this manner the iron is completely coated and for roofing purposes this may be a good improvement for treating sheet iron to en able it to withstand exposure to the weather without rusting. Arsenic is objectionable to use in the arts, scientific american, 1861-09-07
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