FREEZ′ING MIXTURES

See Ice and Refrigeration . FRENCH BER′RIES. Syn. Persian berries , Avignon b. ; Graines d’Avignon , Fr. The unripe berries or fruit of the Rhamnus infector i us . They are imported from France and Persia; those from the latter country being esteemed the best. Some writers state that the Persian berries are the product of a distinct species, namely, R. amygdalin us . They are chiefly used for dyeing morocco leather yellow. Their decoction dyes cloth, previously mordanted with alum, tartar, or pro to chloride of tin, of a yellow colour; with sulphate of copper, an olive; and with red sulphate of iron, an olive-green colour.