I've been looking for an answer to this one for a while - when preparing glass plates and applying a gelatin sizing it is said to use chromealum - the challenge is the ratio is almost never mentioned. My copy of the Alterntive Process text doesn't seem to specify the dilution - should it be a 10% or 20% solution? Maybe it doesn't matter . . .

If you know what resource is available that identifies the best practice for this chemical, I'd love to get my hands on it -

thanks.