Читать книгу The Mixing of Colours and Paints - F. N. Vanderwalker - Страница 19

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Blue Black.—A black pigment made from charcoal secured by burning vines and twigs. A carbon black which is permanent and of good drying character.

Indigo.—A natural color extensively used by the dye industry. It is an extract from the indigo plant. A blue-black pigment which drys slowly and fades in sunlight. It should not be mixed with lead or lead colors. The blue tone of indigo can be duplicated by mixing ivory black, ultramarine blue and a bit of emeraude green. This makes a permanent and good drying black.

Indigo is now made from coal tar dye and is widely used.