...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」
...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」
...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」
...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」
...With carmine and the cochineallakes, or intense blue, the ochres are best not employed...
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」
...They vary exceedingly in colour, fromyellow to brown, murrey, and gray, but otherwise do not differ fromordinary 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」
...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」
...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」
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