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Encyclopedia Britannica - Main :: GRA-GUI |
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GROUP III . Sulphides.Some of the members of this group are liable to contain free sulphur
element
cadmium yellow blackens emerald
vermilion
change whereby the red form passes into the black variety. This change , frequent in water-colour drawings, is scarcely observable in works painted in oil. The sulphides comprise cadmium yellow (CdS), king's yellow (As2S2), realgar (As2S,), antimony, red (Sb2S3) and vermilion
ultramarine
violet
part
sulphur
painting
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