Blanch Firmes

Blanch-firmes. In ancient times the Crown rents were many times reserved in libiris albis or blanch-firmes, in which case the buyer was holden dealbare firman, i.e., his base money or coin, below standard, was melted down in the Exchequer, and reduced to the fineness of standard silver, or instead thereof, he paid twelve pence in the pound by way of addition, Jac. Law Dict.