I have a print that's really nice but it has a bit of a black spot on the white border because I didn't mask the edge carefully in the easel. I want to get rid of that black blotch and bleach it totally into white to match the rest of the border. Otherwise I have to throw the print away, unless I can cover it with the matte. I have a lot of farmer's reducer, but I've never used it. Can kodak farmer's reducer do this kind of thing?