restrainer for

Do I need/want KBr in a PQ-Glycin print developer or is benzotriazole alone adequate? I'm nt really concerned about tone at this point, I know I've done it w/o bromide when I wanted cooler tones. I think I've asked this before but it was years ago and I dont remember the answer. Or the question.

I don't have an answer, but I've been thinking about it. A print developer formulated with benzotriazole as its only restrainer sounds doable, but how will it respond after some paper has passed through it? Bromide will be released when developing paper, since nearly all papers have silver bromide. So, it seems that, inevitably, print tone will change to warmer tones rather quickly. On the other hand, if both benzotriazole and KBr are used as restrainers, the released bromide will be, for the most part, a small amount of the bromide already present in the solution, so print tone will be stable after more prints have been developed in the solution.

Can anyone comment on this?

With Phenidone you want no Benzotriazole for warm tones and about 5gm per litre Bromide (for 0.5 gm Phenidone 12 gm Hyroquinone) or 2 gm Bromide and 20 ml 1% Benzotriazole solution for cold tones.

Ian

Ian Grant said:

With Phenidone you want no Benzotriazole for warm tones and about 5gm per litre Bromide (for 0.5 gm Phenidone 12 gm Hyroquinone) or 2 gm Bromide and 20 ml 1% Benzotriazole solution for cold tones.

Ian

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Are you saying benzo IS an adequate restrainer for a PQ-Glycin developer? Because that is what I'm asking.

Ideally you need Bromide & Benzotrialzole for Colder tones, an NO Benzotriazole for warm tones.

Ian