Quote Originally Posted by glbeas
I read that cyanotypes will oxidize over time and turn a richer blue, so you may not be out of luck on the ones you have made already. Alternately the book said to put it in a peroxide bath to bring up the more intense blue. Anybody here seen that and tried it yet?
what i found in the description is that using peroxide brings immediately the end result after wash of the picture. It does not harm or infuence the picture but is a method to show you directly the end result.

I will try a wash of 10 minutes and a prewash with vinigar for 1 minute in a different bath.