Note:  Do not rely on this information. It is very old.

Lemon Saltsof

Lemon, Salts of, also called salts of sorrel, consist of an acid oxalate of potash, which occurs in the leaves of the wood-sorrel, from which it was formerly largely prepared, chiefly in the neighbourhood of the Black Forest. It forms transparent crystals, soluble in water, and possessing a, sour taste. It may be used for taking out rust- or ink-stains from linen and such materials.