Chrome alum hardening fixing bath recommended for hot weather processing. Also known as Ansco 202.
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This formula, when freshly mixed, is especially recommended for use during hot weather, but it rapidly loses its hardening properties, with or without use. Useful life is only 1 day.
Scum which may form on the surface of the negative when an old bath is used is removable by swabbing with cotton-wool before the negative is dried.