I am going with 30grams to 10 litre as suggested , made the prints and now I will do the bleach and report back . I have made five fairly identical 11x14 of one neg on three different papers, Ilford mg4matte and gloss and Ilford warmtone.
I hope to tri tone tommorow and will let you all know how I feel after this.

thanks to all.

Quote Originally Posted by Ian Grant View Post
There's too many variables Bob. However a 100g/litre of each diluted 1+10 works very fast, that's 10g/litre, your talking a touch under 3g/litre, I'd start by diluting that a further 1+9 (1:10) so you have about 3g/litre Ferricyanide & KBr

One nice point about using this bleach is if it goes too far, you just wash and re-develop, the room light is usually sufficient to re-expose the bleached emulsion.