There was a thread here about a month ago on the topic of CuSO4 bleaches. A poster found a recipe for a reversal bleach based on CuSO4 on the Web and found that it completely failed. The only CuSO4 bleach recipe I have found came from "Modern Photographic Processing" by Haist where a solution of acidic CuSO4 and hydrogen peroxide selectively strips Ag-rich emulsion from lith film.

I don't know what your project entails, but potassium permanganate and potassium dichromate are much more reliable as bleaches for B&W, with permanganate being the less toxic but dichromate working more quickly and with far less emulsion damage.