I hope this isn't a stupid question......(posted 8818 days ago)If I understand the Pyro process correctly, the stain is produced by the oxidation products of pyrogallol, principally purpurogallin. Would it therefore be possible to develop a film in a different developer, say Rodinal, and then immerse the fixed film into an oxidised bath of pyro, in order to get a similar staining effect? (I am not sure if a latent stain is produced by the pyro during development, which is then induced by the post-fixing alkaline bath, which would preclude this). However, if it as possible to stain after development in a non-pyro developer, the overall process might be easier (and possibly safer), and you might be able to combine the acutance and compensating effect of a developer such as dilute Rodinal with the highlight separation effects of pyro. Any thoughts?