Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 231
f copper, nickel, brass, or gilding metal,which is a variety of brass rich in copper. Articles to beplated are first cleansed from grease by boiling in a weaksolution of soda or potash, and then dipped into dilutednitric acid to remove any film of oxide. They are thenbrushed with a hard brush and… … Fig. 131. The silvering bath consists of a solution of silver cyanide,in potassium cyanide and water (one part of silver cyanideand one part of potassium cyanide in 125 parts of water),which should be gently warmed while the deposit istaking place. The objects to be silvered are suspended in chap,…
Electricity
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