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Pigments And Bases Are Subject To Deoxidation Or To A Loss Of Oxygen

in which case the colour is apt to deepen. Pigments generally are more
affected by oxidation and fading in a water vehicle, and by deoxidation
and darkening in one of oil.

A principal test of permanency in pigments is the impunity with which
they bear exposure to light and air, an artistic proof of their
stability the mere chemist is apt to neglect. Provided the colour remain
unaffected by sulphuretted hydrogen, &c., he seldom hesitates to
pronounce it safe. But a pigment may be fast in one sense and fugitive
in another, believed in by the laboratory, and found wanting by the
studio. It has happened before now that the same colour has been dubbed
durable and the reverse, by the man of science and the man of art. The
former, we take it, looks upon a pigment as a coloured substance of a
certain composition, possessing maybe an acid and a base, either, or
neither, or both of which, gases and other reagents may injure or
destroy. The latter views a colour chiefly as part and parcel of his

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