Valuable Secrets concerning Arts and Trades:
or Approved Directions, from the best Artists, for the Various Methods...
Printed by Thomas Hubbard,
Norwich, 1795Chap. V. Secrets concerning colours & painting.
§ VIII. Preparations of colours of all sorts for oil, water, and crayons.
LXXXVI. To make indigo.
Put some isatis, otherwise woad, or glastum, with slacked lime, to boil together in water. There will rise a scum, which being taken oil, and mixed with a little starch, makes the indigo.
LXXXVII. To make a yellow.
What the luteola dyes yellow, becomes green by the woad, or glastum. Whence we may justly conclude, that green is not a simple colour, but a mixture of blue and yellow; as the yellow itself is a compound of red and white.
LXXXVIII. An azure of mother-of-pearl.
Take any quantity of superfine tested silver inlaminas. Put it a little while in vinegar; then, taking it out of it, drew over the laminas some pounce-powder to alcoholise them. Next stratify them in a crucible; and when red hot, take them off from the fire, and you will have a fine azure.
LXXXIX. A white for painters, which may be preferred for ever.
Put into a large pan three quarts of lintseed oil, with an equal quantity of brandy, and four of the best double dialled vinegar; three dozen of eggs, new laid and whole; three or four pounds of mutton suet, chopped small. Cover all with a lead plate, and lute it well. Lay this pan in the cellar for three weeks, then take skilfully the white off, then dry it. The dose of the composition for use is six ounces of that white to every one of bismuth.
XC. Another white for ladies' paint.
The pomatum which ladies make use offer painting is made as follows. - To four parts of hog's-lard add one of a kid. Melt them both together, then wash them. Re-melt and wash theirs again. Then add four ounces of ammoniac salt, and as much of sulphur, in subtile powder. This white will keep as long as that mentioned in the preceding receipt.
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