Years ago I bought a book called, "Developing", by C.J. Jacobson and in it is an article about "two bath developement". It gives a formula for both developers and tells how to use them. If you can find a copy of this book--------you're in shape. If not: let me know how old you are and I may sell it to you. The age means only that I prefer to sell this to a younger photographer. Doesn't mean that you cannot have it. Only a preference. I am 64 3/4.(posted 8593 days ago)