Just practicing with a home made gel. I cut a 4x6 square out of a yellow Forever21 shopping bag. Then i loosely taped it in front of my 430EXII and put it in a softbox. The "gel" was pretty thin and light diffused pretty well, but it just made the picture totally yellow. Like something I could have totally done by changing the WB. This is my first time using a gel so i expect the typical OT rape without lube. But what I am doing wrong? I'm thinking more ambient light with a lower flash power? Or do I need a 2nd light source that's clean (without artificial color)?