Or Iodine Scarlet Is An Iodide Of Mercury Having The Body And

opacity of vermilion, and being as much inferior to it in permanence as

it is superior in brilliancy. Of all artistic pigments, it is at once

the most dazzling and the most fugitive, and should have no place on the

palette. If used, it should be with an ivory knife, as iron and most

metals change it to colours varying from yellow to black; hence it

should never be compounded with metallic pigments. So sensitive, indeed,

is it to the slightest touch of metal, that it has been known to turn to

a dull brown merely by being washed over with a colour which had been

taken out of its saucer with a penknife. In the cake, it must be

carefully kept wrapped up in paper, otherwise the presence of metal

tubes or a knife in the colour-box may spoil it. By a foul atmosphere,

the scarlet is soon utterly destroyed, and even metallized. In contact

with the air, it quickly fades away; and has been found to vanish

completely, when exposed to light alone. Employed in water, a thick

glaze of gum-arabic or gamboge adds to its stability. As a landscape

pigment, the colour is out of the general scale of nature; but in

flower-painting its charms are almost irresistible. Nothing certainly

can approach it as a colour for scarlet geraniums, but its beauty is

almost as fleeting as the flowers.


Or Indian Blue Was Known To The Ancients Under The Name Of Indicum Or L500 For The Production Of Artificial Ultramarine By The Societe facebooktwittergoogle_plusredditpinterestlinkedinmail