Can too high temperature of the Potassium Oxalate developer cause solarization. I just got a new heater unit for the developer and used it hotter than normal (normal would be +/- 100deg F). I really like the warm color but could do without the solarizing rebate area. Just to make sure there are no obvious red flag issues, this is what I'm using: Cranes Platinotype 18 drops FO #1 18 drops Pd 2 drops Na2 Brush coating This is a negative that I have printed a bunch and haven't had troubles with before. I could do the trial and error to make sure that the dev temp is the issue but maybe someone could learn me a little.