Page:Domestic economy, or, General recipe book.pdf/6

6 The French way of dying Yellow Silk.

First, alum your silks half an hour in cold liquor, then wash them. Pass them through a pan weld liquor, at a hard heat. If they are to be of lemon yellow, dissolve a trifling quantity of blue vitriol in your pan to the colour required.

Sympathetic Ink.

Dissolve bismuth in nitrous acid: when the writing with this fluid is exposed to the vapour of liver of sulphur, it will become quite black.

Black Ink.

Take of Aleppo galls, in coarse powder. 8 oz; logwood in thin chips, 4 oz; copperas 4 oz; gum finely powdered, 3 oz; blue vitriol, 1 oz.; sugar candy 1 oz. Boil the galls and logwood together in twelve pints of rain water for one hour; strain the decoctic and then add the other ingredients; stir the mixture until the whole be dissolved, more especially the  and then let it subside for twenty-four hours; lastly decant the ink very steadily, and cork it in stone  for use.

Red Ink.

Boil an ounce of fine Brazil wood (in the chips) half a pint of water, and add three drachms of gum arabic, with half an ounce of alum.

Blue Ink.

Dissolve a small quantity of indigo in a little oil vitriol, then add a sufficient quantity of water, in which is dissolved some gum arabic.