235.—Red Colouring.
Beat 1 oz. of cochineal fine in a mortar, to which put 1½ pint of soft water and ½ oz. of cream of tartar; simmer them in a pan for half an hour over a slow fire. Take it off, and throw in ½ oz. of roach alum to strike the colour. You may ascertain the strength by dipping in a piece of writing paper. If not sufficiently strong, simmer it again for a short time. When nearly cold, strain it through a strong piece of canvas, and before you bottle it add 2 ozs. of double refined sugar.