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Encyclopedia Britannica



GROUP III

This article appears in Volume V21, Page 598 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: GRA-GUI
GROUP III . Sulphides.Some of the members of this group are liable to contain free
sulphur
 , and some may give up this
element
  to the metallic bases of other pigments. Thus
cadmium
  yellow blackens
emerald
  green, producing copper sulphide. Another pigment of this group,
vermilion
 , is prone to a molecular
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
  (HgS). It is convenient to give places in the same group to the various kinds of
ultramarine
 , blue, green, red,
violet
  and native, for in all of them a
part
  of the
sulphur
  present occurs in the form of a sulphide. It may be stated that the sulphides of arsenic and antimony just named are dangerous and changeable pigments not suited for artistic
painting
 .


End of Article: GROUP III


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