I was at a photomarket this morning and saw an exposed 120 roll labelled Agfa Isopan ISS / Isopan Super Special. Swapped it for the 35 cents in my pocket and am now wondering how I should develop it... I get only one go at this I think as I don't really want to cut it up. And I don't have some way of making it light-tight again after transferring a clip to the daylight tank. I have on hand plenty of D-76, Rodinal and maybe enough LC-29 to make up a 1+29 batch. A spot of googling tells me it's an ISO100 film designed in the 1940s or 1950s and that one can develop it in D-76... but recommended times vary from "do the same as FP4 and maybe add 20%", to 12 minutes in stock or even 25:00/18C at unspecified dilution. One site notes that the slightest overcooking will result in unusably thick negs. Any suggestions or links to something definitive? Anyone actually used this themselves?