Bleach for black and white prints

[Doremus Scudder]

SLIMT bleaches are very weak. You can use the same proportions of ferricyanide and bromide, but you'll have to mix a bit stronger bleach. Experimentation is in order

Doremus

 

[Fredrixxon]

It's not very critical

Great, but please, give a hint where to start
5g/5g per 1L would be ok?

 

[koraks]

Yup, that should get you started. If that's too slow, double it.

 

[tykos]

SLIMT bleach is (well, all the papers i've read don't provide clear and definitive informations but are more of a "this thing works, but you have to find it for yourself", so the proposal is) 10 parts of pot-ferricyanide and 3.3 parts of pot-bromide.
The proposal is indeed to use them veeeeeery diluted, probably because the technique is mainly directed towards films and not paper.

Curiously, Kachel writes "DO NOT use potassium bromide with B&W papers. It is not necessary and will in fact cause problems.". No further explanations, don't know if it may pose a problem for the techniques or ruin the paper.

 

[koraks]

SLIMT bleach is (well, all the papers i've read don't provide clear and definitive informations but are more of a "this thing works, but you have to find it for yourself", so the proposal is) 10 parts of pot-ferricyanide and 3.3 parts of pot-bromide.

Yes; when I experimented with SLIMT, I made concentrates at these ratios that I could dilute to a working strength SLIMT pre-bleach. When I said the SLIMT solutions are usable here, I was thinking of the concentrates I made. I don't recall if the concentrates were proposed in Kachel's paper; I vaguely recall they were.