![]() ![]() Raw sienna (PBr7): a naturally occurring yellow-brown pigment from limonite clay.When calcined (heated) it is referred to as burnt umber and has more intense colors. Raw umber (PBr7): a natural clay pigment consisting of iron oxide, manganese oxide and aluminum oxide: Fe 2O 3 + MnO 2 + nH 2O + Si + Al 2O 3.Minium (pigment): also known as red lead, lead tetroxide, Pb 3O 4.Ĭlay earth pigments (naturally formed iron oxides).Burnt sienna (PBr7): a pigment produced by heating raw sienna.Sanguine, Caput mortuum, Indian red, Venetian red, oxide red (PR102).Cadmium red (PR108): cadmium sulfo-selenide (Cd2SSe).Realgar: As 4S 4 - a highly toxic natural pigment.Chrome orange: a now obscure pigment composed of a mixture of lead chromate and lead(II) oxide (PbCrO 4.Cadmium orange (PO20): an intermediate between cadmium red and cadmium yellow: cadmium sulfoselenide.Bismuth vanadate orange (PO83) non-toxic pigment similar to vermilion.Zinc yellow (PY36): zinc chromate ( ZnCrO 4), a highly toxic substance with anti-corrosive properties which was historically most often used to paint over metals.Lead-tin-yellow: PbSnO 4 or Pb(Sn,Si)O 3.Yellow ochre (PY43): a naturally occurring clay of monohydrated ferric oxide ( Fe 2O 3. ![]()
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