Silver White *** S (Flake/Lead White) One of the first artificially produced pigments, white lead mixes well with oil to a smooth uniform viscosity and has excellent opacity and brush handling qualities. Possessing great surface strength, it is nevertheless toxic in nature and will react by darkening when exposed to sulphur compounds or fumes. The latter reactivity is not too important as lead pigment in use is normally well protected by the oils and varnishes with which it is mixed.
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