hi everyone,

i'm trying to find some information on a process i've heard described as "thiocarbomide silver gelatin" printing and "thiocarbomide sepia toning," and thusfar i've had almost no success. even mr. bergstrom at photographer's formulary was stumped. so, does anyone here have any info about this process? if so, could you please share?

you can see some examples at the following url:

http://www.aperture-photo.com/site/nudes/knill/knillframeset.html

thanks in advance, brad daly

-- brad daly (bwdaly@scott.net), May 05, 1999

Answers

I'm not sure about "thiocarbomide silver gelatin" printing but thiocarbimide toning is easy.

Thiocarbimide toning is easy to do. It uses three chemicals:

A bleach made from potassium ferricynide plus potassium bromide

A toner that is two parts:

Part A is thiourea, and part B is sodium hydroxide.

The color of the final toning is dependant upon a number of interrelated factors:

Type of paper, type of developer, development time, bleach dilution, amount of bleaching time, and finally, the mixture of toner part A to toner part B.

Colors can range from a deep blue black on a lightly bleached bromide paper to purple-brown, dark brown, sepia, and yellow on a chloro- bromide paper.

-- steve (swines@egginc.com), May 06, 1999.