I was wondering if anyone was familiar with thiocarbamide (thoiurea) toning. I'm not even sure if this is the correct chemical but I believe it gives a blue-green tone. I can't seem to verify my information.

-- Andy Laycock (agl@intergate.bc.ca), April 25, 1999

Answers

Thiocarbimide toning gives cool purple-brown, dark brown, sepia, to yellow toning depending upon the paper, paper developer, bleach formula (amount of bromide), and mixture of toner part "A" (thiourea) and toner part "B" (sodium hydroxide).

-- steve (swines@egginc.com), April 26, 1999.

Photographer's Formulary sells it. (www.montana.com/formulary/dnloadcat.html) Here's their description: "Formulary Thiourea Toner will give beautiful rich brown sepia-like tones. The print is first bleached using a ferricyanide-bromide bath then redeveloping 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." The price is $13.50 to make a one liter working solution. Cat. No. 06-0045 Hope this helps, let us know!

Walter

-- Walter Massa (Massacam@aol.com), May 26, 1999.