...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」
...With regard to theircomposition, chemical analysis has shown several of the blues to beoxide of copper with a small proportion of iron; none containing cobalt...
George Field 「Field's Chromatography」
..."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」
..., and areobtained by the action of heat on mixtures of earthy or metallic baseswith cobalt...
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」
...The blues of cobalt, on whatever base they may be prepared, aredistinguished from native and artificial ultramarines by not beingdecolorised by acids...
George Field 「Field's Chromatography」
...Is a pale ultramarine, with a cobalt hue; and, in spite of its name,less permanence than belongs to the richer and deeper sorts...
George Field 「Field's Chromatography」
...But thereis obtainable a compound of zinc and cobalt which gives a blue not onlyfree from green, but inclining rather to red...
George Field 「Field's Chromatography」
...Compounds of sepia and yellowochre, gamboge, raw Sienna, or cobalt and aureolin, are severallyuseful...
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」
...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」
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