Photographers’ Formulary Thiourea Toner, Variable Strength Toner for Black & White Prints, 1 Liter

FORMULARY THIOUREA TONER will give beautiful rich brown sepia-like tones.The print is first bleached using a ferricyanide-bromide bath then redeveloped in a sulfide bath. In this process, the silver metal in the print is first converted to silver bromide, then to brown silver sulfide.The end result will give the impression of a print made in the late 1800's.