Exposure Development Timing
Solarization effect is achieved with 2 exposures and 2 development times. NOTE: you don’t stop or fix between these exposure/development stages – do in one continuous flow.
Expose paper (E1)> develop in solarizing developer (T1) > short exposure (E2) > continue development (D2) .. then stop & fix & wash as you would any other print.
Formulas & worksheet
A current best practice developer is Solarol… a developer compounded specifically for solarization. As of 1915, it is an expensive choice (around $38.) It works;is consistent, and doesn’t require much experience. You can use it with the supplied directions and bahboom — good solarization within one printing session.
Formulas for those cautious enough to make from skratch.