...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」
...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」
...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」
...It is one of the bestof yellow ochres...
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」
...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」
...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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