I found some old kodak developer a few weeks ago in the storage closet, a glass vial with a cork top, white powder. just the volume itself would lead me to think you would need many or quite large tablets for this to be successful.
seemed like it was a big fad back then, tablet everything, they even tried to make food tablets. If you search for those old news reels advertising products of the future you can see them. even in bugs bunny cartoons lol