Nice piece of work. There are a lot of theoretical objections to practical matters voiced in this forum, but in the mantra of the experimentalist, "if it happens, it must be possible".
Would you consider examining non-photographic sodium carbonate and bicarbonate in a similar fashion? I'm pretty sure that the hot-tub and kitchen grades are rather pure; it has been stated (with authority but not necessarily accuracy) that anything but reagent grade contains chloride and is unsuitable for photography. Since I don't make up my own developers that often, I don't have a dog in the fight, but I've always wondered what the facts of the matter were.