If you decide to experiment, just remember that the bleach is very corrosive. You need good ventilation and proper disposal. Simple baking soda
will instantly neutralize it. The powder version is largely sulfamic acid. Processing can be done in simple rotating drums. I think anyone who
tries this in trays is a bit nuts. The bleach fumes can really mess up your lungs. The developer and fix are similar to ordinary black and white
chemistry, however, and quite mild. But like I said, I'm extremely skeptical that the paper will be any good this old.