If a ferric EDTA bleach goes alkaline, what happens to the film? Will it stain to the resulting negative? The 'chrome films I crossprocess come out like masked colour negatives when they should have 'clear' bases instead. I'm thinking that the home-brewed ferricEDTA bleach I'm using must be too alkaline. Don't have a pH meter to determine the pH of this bleach. Could this "mask" be iron stain? If this bleach is indeed slightly alkaline, will it cause this stain?