Quote Originally Posted by James1 View Post
@Ian - interesting. I'm sure one of my reformulated packets of A49 stated one of the sachets contained CD1. That perhaps is the case for modern Calbe A49, but I don't have access to the MSDS to check.
Calbe do use CD-1 N,N-Diethyl-1,4-phenylendiammoniumsulphate in the re-frormulated version A49, it would be better than the CD 4 I suggested.

This type of developer hasn't been fully explored and there's many possibilities.