...It is only when he is seen withthe sun shining upon him that the cobalt blue patches in his plumageare noticed... 
Douglas Dewar 「Birds of the Indian Hills」
... Muriate of cobalt is of a pale pinkcolor; a very slight heat, by removing a little moisture, changes it toa green...
Henry H. Snelling 「The History and Practice of the Art of Photography」
..."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」
...Raw sienna compounded with cobalt, indigo, or Prussian blue, and a verylittle bistre, yields good sea greens, that with indigo being the mostfugitive...
George Field 「Field's Chromatography」
...They are divisible into three classes—the stannic cerulianblue, the aluminous cobalt blues, and the siliceous smalts...
George Field 「Field's Chromatography」
...With regard tosmalts, they are, as artist's pigments, inferior in stability to otherblues of cobalt...
George Field 「Field's Chromatography」
...To obtain a perfect blue, neitherinclining to purple nor green, the cobalt and alumina should be freedfrom iron, and the former, as much as possible, from nickel also...
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」
...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 is made by adding to asolution of ordinary phosphate of soda in excess a solution first ofsulphate of zinc and then of sulphate of cobalt, and washing andigniting the precipitate...
George Field 「Field's Chromatography」
...Behind it, are the artificial ultramarines;and behind them again, cobalt and cerulian blue...
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」
...of cobalt present...
George Field 「Field's Chromatography」
...With French blue,or cobalt and white, a set of beautiful warm or cold grays may beobtained, in proportion as the brown or blue predominates...
George Field 「Field's Chromatography」
...Alone, blue black is useful as a cool shade for white draperies; andcompounded with cobalt, affords a good gray for louring clouds...
George Field 「Field's Chromatography」
...For like purposes, the black with ultramarine ashaffords a very soft hue, and with light red and cobalt in differentproportions yields silvery tones most serviceable...
George Field 「Field's Chromatography」
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