Copper Borate

is obtained by precipitating sulphate of copper with borax, washing the

residue with cold water, and, after drying, igniting it, fusion being

carefully avoided. In this manner, a pretty yellowish green is produced,

which upon longer ignition assumes a dark green shade: the mass is

levigated for use. The compound has the objection of being glassy, and

possessing little body, but is preferable to verdigris as to permanence.

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