...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 yellows are said to have been, inmany cases, vegetable colours; but it is likely earths and ochres weretheir chief source...
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」
...In its generalqualities it resembles the ochres, with the same eligibilities andexceptions, but is more transparent, as well as purer, clearer, richer,and brighter...
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」
...Like other ochres, they may be safely used in admixture withpigments which are themselves permanent...
George Field 「Field's Chromatography」
...It is one of the bestof yellow ochres...
George Field 「Field's Chromatography」
...They vary exceedingly in colour, fromyellow to brown, murrey, and gray, but otherwise do not differ fromordinary ochres...
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」
...Especially dothese changes take place when the iron oxides are not associated with anearthy base; when, in fact, the so-called ochres cannot be classed assuch...
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」
...Lightred has the good properties common to ochres, dries capitally, andfurnishes an excellent crayon...
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」
...It is an excellentdryer in oil, and has often been used as a siccative with other colours,but it cannot safely be so employed except with the ochres, earths, andblacks in general...
George Field 「Field's Chromatography」
...Being an artificial iron ochre it is more chemically active thannative ochres, and needs to be cautiously employed with pigmentsaffected by iron, such as the lakes of cochineal and intense blue...
George Field 「Field's Chromatography」
...Practically,therefore, ochres have an antipathy to sulphur, moist or dry, by itselfor in combination; and are, so to speak, the disinfectants of thepalette...
George Field 「Field's Chromatography」
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