The main historical use for Uranium seems to have been as a negative intensifier. In this use, it is said to outperform even mercury, and so should be useful for making darkroom blinds
I believe Uranotypes are an Iron process - like Pd/Pt and vanDyke. But unlike most others the image isn't formed by metal, but by insoluble oxides. The U(VI) in the Uranyl Nitrate is reduced to U(IV), probably as brownish black Uranium Dioxide.
But that is probably more than you wanted to know?