1867 Six Hundred Receipts by John Marquart

600 MISCELLANEOUS VALUABLE RECEIPTS.

114

wliich, volume for volume, contains so large a quan- tity of colouring- matter. A practical colourman says that it contains even ten to one more than any other colouring-matter. It is, on this account, much used in house-painting, and also in colouring paper- hangings. Indigo. — Another blue colour, much used in com mon painting, is'one but the best and purest kind of this colour is proper for oil-painting : that of an inferior quality is only fit for distemper, as the oil renders it black or green. Indigo grinds fine, and bears a very good body. Its natural colour, how- ever, being very dark, almost indeed approaching to black, it is seldom or never used without a small mixture of white. Ultramarine is the richest, mellowest, most beauti- ful, and lasting of all blues ; but its extravagant price — nearly equal, when pure, to its weight in gold prevents its being introduced, unless veiy rarely indeed, into house-painting. Smalt, Zajf're, Azure, Saxon Blue, or Enamel Blue. — It is of a lovely azure hue, but, if not bought in the form of powder, is very difiicult to grind, and it can be used only in a peculiar manner. Blue Verditer, — This is a beautiful blue, obtained from the waste nitrate of copper of the refiners by adding to it a quantity of chalk ; but it is only proper for distemper: it does not admit of being used w^ith oil, unless a considerable mixture of white is intro- duced. Greens, — Verdigris. — This is the best simple green, and the one most in use. It has a bluish tint, but, when lightened by the addition of a little yellow pink, it makes a beautiful grass-green. It