BL'ANCHING, ppr. Whitening. In coinage, the operation of giving brightness to pieces of silver,by heating them on a peel, and afterwards boiling them successively in two pans of copper, with aqua fortis, common salt, and tartar of Montpelier; then draining off the water in a sieve; sand and fresh water are then thrown over them, and when dry, they are rubbed with a towel.
The covering of iron plates with a thin coat of tin is also called blanching.
Blanch-fern, or blank farm, in ancient law, a white farm, was one, where the rent was paid in silver, not in cattle.
Blanch-holding, in law, a tenure by which the tenant is bound to pay only an elusory yearly duty to his superior, as an acknowledgment to his right.
