A descriptive handbook of modern water colour pigments illustrated with seventy-two colour washes skilfully gradated by hand on Whatman's drawing paper : with an introductory essay on the recent water-colour controversy. . us in the gall-bladder of oxen. It is, however, too fugitive to merit muchattention, fading away rapidly by exposure to light; and is,moreover, so difficult to obtain in any quantity, that it isusually replaced by an imitative substitute—often nothingmore nor less than Yellow Carmini . GREEN PIGMENTS. Oxide of Chromium Is artificially prepared by a dry process, and consists
A descriptive handbook of modern water colour pigments illustrated with seventy-two colour washes skilfully gradated by hand on Whatman's drawing paper : with an introductory essay on the recent water-colour controversy. . us in the gall-bladder of oxen. It is, however, too fugitive to merit muchattention, fading away rapidly by exposure to light; and is,moreover, so difficult to obtain in any quantity, that it isusually replaced by an imitative substitute—often nothingmore nor less than Yellow Carmini . GREEN PIGMENTS. Oxide of Chromium Is artificially prepared by a dry process, and consists of theanhydrous sesquioxide. It is one of the most permanentpigments we possess. Oxide of Chromium is a cold, sober sage green, deep-toned and opaque. Although dull, the quality of colour isvery agreeable, and the tints with white are very delicateand pleasing. Oxide of Chromium washes somewhat indifferently, and,being a very dense and powerful colour, must be employed\\\\\\ caution to avoid heaviness of effect. Viridian, Or Finidi Veronese Green, differs from the above pigmentin being a hydrated instead of an anhydrous sesquioxide ofchromium, and in being transparent instead of opaque. It is extremely : irn. Viridian is a bluish green, possessing great depth ofcolour. In its pale washes it is unsurpassed for mixture of blue and yellow pigments will afford agreen so beautiful and stable. Emerald Green Consists of aceto-arsenite of copper prepared by precipi-tation, and is the most durable of all the greens with a ;»per base. It is an extremely vivid colour, which isdurable under exposure to light, but has a tendency todarken in an impure atmosphere. Where Emerald Green is required no mixture of hlueand yellow will serve as a substitute. It works ratherbadly, and must not be mixed with any of the Yellows ofCadmium. Hookers Green Is a mixed pigment, consisting of an intimate combinationPrussian Blue and Gamboge, and is a very transparent and serviceabl
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