Why don't you think it's working? It may be hard to tell topside outside. The place I notice it is when I take the photos for the new Dee-Rag fabric to add to the website. My sewing area has flourescent lighting which casts a strange color so I do a MWB and the fabrics colors come out perfectly. You might want to try something like that. It's underwater where the MWB will add so much red.