...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」
...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」
...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」
...Like other ochres, they may be safely used in admixture withpigments which are themselves permanent...
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」
...Is a light yellow ochre, with no special distinguishing quality, exceptthat its tints are rather purer in colour than most 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」
...All the yellow ochres are moreor less reddened by being burnt, as yellow oxide of iron itself becomesred on calcination...
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」
...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」
...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」
...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」
...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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