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GROUP III

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Originally appearing in Volume V21, Page 598 of the 1911 Encyclopedia Britannica.
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GROUP III . Sulphides.—Some of the members of this group are liable to contain See also:free See also:sulphur, and some may give up this See also:element to the metallic bases of other See also:pigments. Thus See also:cadmium yellow blackens See also:emerald See also:green, producing See also:copper sulphide. Another pigment of this group, See also:vermilion, is prone to a molecular See also:change whereby the red See also:form passes into the See also:black variety. This change, frequent in See also:water-See also:colour drawings, is scarcely observable in See also:works painted in oil. The sulphides comprise cadmium yellow (CdS), See also:king's yellow (As2S2), See also:realgar (As2S,), See also:antimony, red (Sb2S3) and vermilion (HgS). It is convenient to give places in the same group to the various kinds of See also:ultramarine, See also:blue, green, red, See also:violet and native, for in all of them a See also:part of the sulphur See also:present occurs in the form of a sulphide. It may be stated that the sulphides of See also:arsenic and antimony just named are dangerous and changeable pigments not suited for See also:artistic See also:painting.

End of Article: GROUP III

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