Re: ..Glass plate negatives..

Jonathan Bailey (quryhous@midcoast.com)
Wed, 31 Dec 1997 05:50:49 +0000


>> I've heard of people adding benzotriazole (sp?) to the developer for this
>> kind of work.
>
>..any idea on concentration?..

Cor-

The Darkroom Cookbook say the following.... take it for what it's worth....

"Uses: Organic antifoggant and density depressant in developers.
Benzatriazole acts as a restrainer without effecting other properties of
the developer. It can be used as a fog restrainer when processing outdated
papers.
When true black image tones are desired with bromide papers, benza.
should be used in addition to, or substituted for, pot. bromide. Make a
0.2% solution of benza. (2 grams in water at 125*F to make one liter) then
reduce the bromide to 1/10 or 1/6 strength and use just enough benza.
solution to prevent developer stain or fog. Some experimentation will be
required...."

"Notes: Benza. does not dissolve readily in cold water. Use hot water @
125*F or higher."

"Trade names: Edwal's Liquid Orthazite, which containes approx. 3%
solution of benza. with sodium sulfite. Kodak Anti-Fog #1 (no longer
manufactured.)"

Hope this is of some small use.

Happy New Year-

Jon Bailey
St. George, Maine