I need to yellow some card stock to make aged retro prints via a laser printer. I don't want to wet and dry it because it is a pain to get it flat again. Is there a light i can put it under or a light spray that will do it. I was thinking maybe a spray on oak colored poly or something like it. Any ideas. Only think I could find on google was to soak it in coffee and tea but I knew that also know about print wash but both cause the paper to curl.