Quote Originally Posted by Matthew Rusbarsky View Post
Try some vinegar to lower the PH of your wash, but I bet the issue is your light source. Google the wavelengths of halogen. Very little of it is in the UV range. When there is no sun, I use a single 15w BLB. Covers up to 8x8 inches and gives me exposures of about 1 hour with double-coated traditional chemistry. Also, overcast days are the best for printing cyanos outdoors. You might have more sun than you think you do.
Yes, vinegar was a suggestion I found, too. But for me the muriatic acid was handier than going across the road to raid the kitchen pantry. So far as I know any acid would have worked. At least any acid would reduce the pH, and I don't know that there are any acids which would interfere with the reactions in small quantities.

For paper I was using the presensitized paper from Freestyle. It worked fine once I got the pH down. But I can see that in the long haul I will want to coat my own.