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Plumbago Bronze

This bronze is obtained by brushing the surface of the medal with plumbago, then placing it on a clear fire till it is made too hot to be touched, and applying a plate brush so soon as it ceases to be hot enough to burn the brush. A few strokes of the brush will produce a dark by a partial solution of the copper. 3781. Green Bronzes for Figures of sulphate of copper. According to the proand Busts. Green bronzes require a little portions observed between the zinc and the more time than those already described. copper in the composition of the brass article, They depend upon the formation of an so will the tints obtained vary. In many inacetate, carbonate, or other green salt of cop- stances it requires the employment of a slight per upon the surface of the medal. Steeping degree of friction with a resinous or waxy for some days in a strong solution of common varnish, to bring out the wavy appearance salt will give a partial bronzing which is very characteristic of moire, which is also singularbeautiful, and, if washed in water and allowed ly enhanced by dropping a few iron nails into to dry slowly, is very permanent.

Sal ammoniac may be substituted for common salt.

Even a strong solution of sugar, alone, or with a little acetic or oxalic acid, will produce a green bronze; so also will exposure to the fumes of dilute acetic acid, to weak fumes of hydrochloric acid, and to several other the bath.