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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.
