Читать книгу The Mixing of Colours and Paints - F. N. Vanderwalker - Страница 16

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In the artists and decorators' palette cadmium lemon or pale yellow, cadmium yellow, cadmium deep yellow and cadmium orange are sulphide colors and should not be mixed with white lead or light, lemon, medium or orange chrome yellow, nor with American vermilion. Mixing such colors together releases sulphur and causes detrimental discoloration—darkening the mixture.

Cadmium Yellow.—The cadmium yellows—pale, lemon, deep and orange—are artists' and decorators' colors of considerable value. Prices for these colors are apparently high, but they are economical because they have great tinting strength. Cadmium lemon yellow, even though it has somewhat of a warm hue, transmits an exceptional amount of green staining strength when mixed with blue—and likewise makes strong and clear orange colors when mixed with red.

Cadmium yellows as a class are quite permanent for interior decoration, furniture finishing and pictorial painting—orange cadmium is especially permanent. It ought not to be mixed with white lead, chrome yellows, American vermilion nor with any of the colors made from a copper base.

Lemon Zinc Yellow.—Mixed with blue black produces warm durable greens of great value in landscape painting. Zinc yellow is balanced in color exactly between Chinese vermilion and emeraude green. Zinc yellow, alizarine scarlet and cobalt blue constitute a palette of permanent colors for artists and interior decorators which meets nearly every demand in color mixing. A chromate of zinc which changes to a greenish hue when exposed to strong light and remains fixed with that color. A permanent color after changing to greenish yellow.

Cobalt Yellow (aureolin).—A yellow which has good transparency for glazing. A good drying color and one which is fairly permanent to light except when mixed with certain lake colors. Used as a glazing color, it is serviceable over any color. For making light yellow tints from this yellow, zinc oxide should be used. Chemically cobalt yellow is a double nitrate of cobalt and potassium.

Citron Yellow.—A chromate of zinc pigment which is fairly permanent to light. What fading does occur in time is toward a greenish hue, where it remains permanently fixed. A stable color, chemically, which mixes well with other colors. Varnishing retards the fading of this color.

Naples Yellow.—A useful color mixed from cadmium orange and zinc oxide. Permanent and a good drying pigment.

Indian Yellow.—A useful color which is rather permanent except when placed so the direct rays of the sun strike it. When faded it regains its color in darkness. Indian yellow is a good drying pigment which is stable chemically and mixes satisfactorily with other colors.

Mars Yellow.—This color, together with Mars Orange, Mars Brown, Mars Violet and Mars Red, belongs to the ochre class and owes its color to oxide of iron. Slow drying colors which are permanent and which may be mixed with other colors of a mineral nature. They should not be mixed with lake colors.

Permanent Yellow.—A color made of chromate of barium and zinc oxide. Permanent to light and stable chemically for mixing with other colors. It should not be mixed with raw ochres.

Lemon Yellow (Perfect Yellow).—A chromate of barium color. Permanent to light. Generally a stable color, but should not be mixed with madders because of unfavorable reactions.

Strontian Yellow.—A fairly permanent yellow of a neutral hue. Made of chromate of strontium.

Golden Ochre.—Raw sienna.

Dutch Pink.—A yellow color made from quercitron, the bark from trees. Not a really permanent color. Has good transparency but is superseded by more permanent yellows.

Yellow Lake.—Made from quercitron bark, as are also Dutch pink and brown pink. A fugitive yellow transparent color as made originally, but coal tar yellow lakes now made are more nearly permanent.

Gamboge.—A yellow gum resin of natural origin. Has the same transparent nature as lake pigments, but is not permanent in color. Of little value for permanent decoration.

Italian Pink.—A transparent lake nearer yellow than pink in color. Made from aniline color and is permanent. It is stable chemically and dries well.