..."Aureolin, in combination with Cobalt and Sepia, or Rose Madder,gives most agreeable and delicate tints for distant trees, whenunder the influence of a soft light, or hazy state of theatmosphere... 
George Field 「Field's Chromatography」
...With cobalt and gamboge it yields an excellent gray, and with cobaltalone a fine purple for heather...
George Field 「Field's Chromatography」
...It is much used both in figure andlandscape painting, giving fine grays with cobalt, and serviceablecompounds with yellow ochre, indigo, lamp black, rose madder, Payne'sgrey, brown madder, &c...
George Field 「Field's Chromatography」
...Thénard, who obtained it by calcining a well-combined mixture of aluminaand crystals of cobalt...
George Field 「Field's Chromatography」
...Thepurity of the colour, however, does not altogether depend on thecompound of cobalt used; in a great measure—as with other pigments—itrests on the purity of the materials...
George Field 「Field's Chromatography」
...Apart, too, from itsincreased beauty, a cobalt blue containing no iron or nickel is ofgreater permanence than the ordinary products, being less liable to thatgreenness and obscurity which time confers...
George Field 「Field's Chromatography」
...In water-colour painting, cobalt is tolerably firm onpaper, and consequently answers better for some purposes than Frenchblue...
George Field 「Field's Chromatography」
...In marine painting in water-colours, cobalt ismost useful for the remotest parts of seas and headlands...
George Field 「Field's Chromatography」
...Acid, as we have said, is the great test for ultramarine; whence if asample be sophisticated with cobalt, its blue colour will not beentirely destroyed...
George Field 「Field's Chromatography」
...It may be said tohover in tint between a rich ultramarine and cobalt...
George Field 「Field's Chromatography」
...As a pigment, cobalt was unknown to the ancients; but to these vegetableand copper blues of theirs, a third blue may perhaps be added...
George Field 「Field's Chromatography」
...Another Prussian green, with a base of cobalt, is obtained byprecipitating the nitrate of that metal with yellow prussiate of potash...
George Field 「Field's Chromatography」
...With other physical defects,and a colour inferior to the chrome oxides, cobalt green has never beena favourite with artists, though justly eulogised by chemists...
George Field 「Field's Chromatography」
...A compound analogous to cobalt green may be made, of an olive hue, withmore body, and equally stable...
George Field 「Field's Chromatography」
...In sunrise and sunset clouds, a mixture of the brownwith cobalt yields a cold neutral green, adapted for those clouds at thegreatest distance from the sun...
George Field 「Field's Chromatography」
...Mixed with cobalt, it forms a fine shadow colour for distant objects;and with indigo or Prussian blue and black, is serviceable for theshades of those nearer the foreground...
George Field 「Field's Chromatography」
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