I wonder how many rolls of undeveloped Kodachrome are still out there? Of course they cannot be conventionally developed, but they can still be processed as black and white, since Kodachrome is basically black and white film to which dyes are added in development. (This process of adding dyes in development is what made the process so complicated). I had a couple of exposed rolls that I just never got around to sending to Dwaynes in Kansas City for processing, so after reading about how some other people had done it, I gave it a shot last night.
I used a developer called Rodinal, (dating from 1893!) at a dilution of 100+1, and was thrilled to get usable results, such as the image below. I still have a couple of unexposed rolls of Kodachrome that I can now use; I just won’t get “nice bright colours.”