In 1978-79, while a student at Apeiron Workshops in Millerton, New York, someone gave me a film developer to use that was weird and amazing -- Harvey's Panthermic 777 (or so I recall the name). It came in a glass gallon jug, and the more you used it, the sludgey-er it got, and the better the film came out. (I wish I had an image to post from back then, but I don't.) The tonal scale was beautiful, though, and the grain was fine. I shot all 35mm then (as now), so getting that kind of tonality on the negative was a big deal!
In doing some research today for my photography 2 class (looking up info on Acufine, another of my favorite developers), I ran across this info on 777. Quite the nostalgic moment. Thanks, Harvey, wherever you are!