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See also: charcoal black, See also: Indian ink, and See also: graphite, less correctly termed black-See also: lead and plumbago—consist of or contain See also: carbon, an See also: element not liable to change
.
The metallic pigments, gold, See also: silver, aluminium and platinum, belong here; of these, silver alone is easily susceptible of change, tarnishing by combination with See also: sulphur
.
Gaoue II
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Oxides.—The oxides have generally been formed at a high temperature See also: ana are not easily amenable to See also: physical or chemical change; they are, moreover, not liable to affect other pigments, being practically inert, red lead only being an exception
.
The oxides include See also: zinc See also: white,
See also: green chromium See also: oxide, burnt See also: umber (a mixture of iron and manganese oxide), See also: cobalt green (CoO,nZnO), cobalt blue (CoO,nAl2O3), coeruleum (CoO,nSnO2), Venetian red, See also: light red, Indian red and burnt sienna (all chiefly composed of ferric oxide), and red lead (Pb204)
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