I mixed it yesterday for the first time, and I'm a bit worried that I goofed. The solution is still strongly green, and I think it's supposed to be yellow. Could the room lights have been too strong? I did it under ordinary bathroom lighting, only realizing afterward that it might be too bright. The one way to find out, of course, is to coat some paper and try it, but I won't have the opportunity to do that for a while.