Page:Treatise on Soap Making.djvu/49

33 The other ashes (although sometimes used in hard soap-making, are more proper for bleaching linen, being preferred for their whitening quality, and mildness of the alkali) are the following:

BLUE PEARL ASHES.

These appear to be a pure alkaline salt, mixed with a small quantity of vitriolated tartar and earth. Half a pound of these will give about 5½ ounces of pure salt.

WHITE PEARL ASHES

Are nearly of the same quality with the former, half a pound of them giving five ounces and seven drams of pure salt, with some vitriolated tartar and earth.