Its not folklore and I could explain it in a way I think it works. However, I'm not sure if the explaination, and what terms I use, would be acceptable or at least the right description of whats happening, so I'm reluctant to do so. I can only say that after 30+ years of printing professionally, it makes a difference...not only which goes first but if you are using, pure light, or filtered light...and then which filter you are using.