Eric, I haven't forgotten about the Rodinal formula. I've saved a
number of posts from rec.photo.darkroom especially from Michael
Gudzinowicz and when I've tidied them up I'll post it.|
The upshot of the posts is that Agfa altered Rodinal in, I think, the 1960s. The amount of p-aminophenol was reduced and the pH was increased to compensate. p-aminophenol is not an expensive chemical, but sodium/potassium hydroxide is much cheaper! Reminiscences of Agfa Viradon having its only expensive ingredient removed also (selenium)!
Eric Neilsen Photo wrote:
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