I am trying to get a blue gel to register color on a white background. Sounds simple enough, but I tried everything tonight.....unsuccessfully. I'm using a gel over a speed light (just using the small sample size gels). I tried different angles, different color gels, stacking gels, different intensity of light, near and far. It makes no difference. Can someone help? I need it for some head shot I'll be doing. At least I thought I'd provide it as an option to the people who asked me to do this. They may prefer the white background they've always used, but I need to learn how to do this anyway. Thanks if you can help!