...And yet, in spite ofthe scale having comprised pure vermilion, ochres, and indigo, it wasnot gaudy, owing to the judicious balance of the colours, and theartful management of the black... 
George Field 「Field's Chromatography」
...The reds seem for the most part to be composed of oxide of iron mixedwith lime, and were probably limited to iron earths and ochres, with anative cinnabar or vermilion...
George Field 「Field's Chromatography」
...The yellow andorange chromates of lead, for instance, withstanding as they do theaction of the sunbeam, become by time, foul air, and the influence ofother pigments, inferior to the ochres...
George Field 「Field's Chromatography」
...Withultramarine, however, red and orange vermilions, yellow and orangechromes, yellow and orange and red cadmiums, aureolin, the ochres,viridian and other oxides of chromium, Indian red &c...
George Field 「Field's Chromatography」
...All of them are brighter and purer than native ochres, andequally stable...
George Field 「Field's Chromatography」
...When carefully prepared, these pigments dry well inproportion to their depth, are marked by a subdued richness rather thanbrilliancy, and have the general habits of sienna earths and ochres...
George Field 「Field's Chromatography」
...For the same reason, it wasapt to suffer in composition with ochres, Prussian and Antwerp blues,and other pigments of which iron was a principal or ingredient...
George Field 「Field's Chromatography」
...With carmine and the cochineallakes, or intense blue, the ochres are best not employed...
George Field 「Field's Chromatography」
...It is one of the bestof yellow ochres...
George Field 「Field's Chromatography」
...True stone ochres are found in balls orglobular masses of various sizes in the solid body of stones, lying nearthe surface of rocks among the quarries of Gloucestershire andelsewhere...
George Field 「Field's Chromatography」
...Most noteworthy areaureolin, the deep and 'pale' cadmiums, lemon yellow, Mars yellow, themodern Naples yellow, the ochres, orient yellow, and raw sienna...
George Field 「Field's Chromatography」
...In this respect thered resembles its compeers, Mars yellow, Mars orange, Mars violet, andMars brown, all of which are iron ochres artificially prepared...
George Field 「Field's Chromatography」
...The colouring matter of these earths is the red oxide of iron, as thatof the yellow ochres is the yellow oxide...
George Field 「Field's Chromatography」
...Like all ochres, it ischaracterized by permanence in water, oil, crayons, and fresco; and is,like most of them, available in enamel-painting...
George Field 「Field's Chromatography」
...Inferior ochres were formerlysubstituted for Indian red, which procured it a variable character; butthe colour being now obtained abundantly can in general be had genuine...
George Field 「Field's Chromatography」
...The Venetian red ofthe present day, however, is an artificial product, containing no earthybase, and therefore improperly classed among the ochres...
George Field 「Field's Chromatography」
...Sulphur alone, and in the dry state, ignited withyellow or other native ochres converts them into browns, varying in hue,and of greater or less durability...
George Field 「Field's Chromatography」
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