By Ernest J. (Ernest John) Parry
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Extra resources for The chemistry of pigments
Of the Eeport) : CHEMISTKY OF PIGMENTS. 32 Of thirty-seven colours exposed to the action of moist air, only the following ten withstood the action of light under Indian red, Venetian red, burnt sienna, yellow this condition : raw ochre, sienna, emerald green, terra verte, chromium oxide, both Prussian blue and Antwerp Of twenty-nine mixtures only blue were entirely destroyed. and Venetian red, and sienna raw two were unchanged cobalt, and ultramarine ash cobalt and Indian A ; red. further series was made in which the colour was ex- posed to the action of moist hydrogen, so as to obviate the " no less than twentyaction of oxygen.
Painting, so as to have a clean surface of iron exposed to the paint. Two dishes were painted with each kind of paint, one of them receiving one coat, the other two coats, the first coat having dried thoroughly (for at least a week) before the second coat was applied. After the second coat had completely dried and hardened these dishes were exposed to the so-called water-and-moisture test, in of water placed in the dishes is at the ordinary dryness repeated a temperature number of times show more or less begins to examined before each which a given amount and allowed of the to evaporate to room.
Of well is Church known. illustrate this : The "I following tried com- pure lead carbonate and the parative experiments with Dutch-made lead hydrated carbonate, or ordinary flake white. The two tilled The . lead pigments were . washed thoroughly with water, and dried before being ground in linseed disoil. oil-paints thus prepared were spread in duplicate series paper and primed canvas. One set was kept in So the other was exposed to strong light. flake white over decided was the superiority of the ordinary upon glass, a dark box ; the pure carbonate, when both series of specimens were after the lapse of various intervals of time, that examined reluctantly compelled to abandon my recommendation Ease in working, solidity of body and rapidity of drying were not the only points of superiority, for the films I was of the latter.