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See also:GROUP I
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Elements.—All the See also:black See also:pigments in See also:ordinary use—See also:ivory black, See also:lamp black, See also:charcoal black, See also:Indian See also:ink, and See also:graphite, less correctly termed black-See also:lead and See also:plumbago—consist of or contain See also:carbon, an See also:element not liable to See also:change
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The metallic pigments, See also:gold, See also:silver, See also:aluminium and See also:platinum, belong here; of these, silver alone is easily susceptible of change, tarnishing by See also:combination with See also:sulphur
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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
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The oxides include See also:zinc See also: |
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