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Photographers' Formulary Thiourea (Thiocarbamide) - 10g

Photographers' Formulary Thiourea (Thiocarbamide) - 10g

B&H # PHT10G MFR # 10-1470 10G
Photographers' Formulary Thiourea (Thiocarbamide) - 10g

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  • 1Description

The Photographers' Formulary Thiourea Toner is actually a sulfide toner. In alkaline solution, thiourea (thiocarbamide) reacts to yield sulfide ions, the active ingredient in the toning bath. The advantage of this process is the avoidance of the foul smelling sodium sulfide bath.

To obtain 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 resulting print can give the impression of a print made in the late 1800's.

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  • 1Description
Synonyms Sulfocarbamide
Sulfourea
Thiocarbamide
Appearance White powder or white/colorless, prismatic crystals
The substance is soluble in water and ethanol
Uses In gold toning baths
Clearing yellow stains from prints
In Mordant solutions for dye toning
Chemical Formula CH4N2S
Notes Thiourea is neither toxic nor corrosive but, unfortunately, it is a potential carcinogen. Use rubber gloves when mixing or handling this compound or its solutions. Wash the work area, trays, and all mixing utensils with water followed by soap and water. Should a solution containing thiourea be spilled on the skin, wash immediately with water followed by soap and water.
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