Marvellous idea, Flickr . Without it, I wouldn't have remembered that I'd used Rodinal back in 2012-ish. This photo ticks a number of "cool" boxes: taken with a Nikon F, (which was showing its age), on Ilford Delta 3200, pushed to 6400 and developed in a Shanghai kitchen-sink darkroom, in Rodinal. Those were the days. It's set me to think about Rodinal again, and then in the last couple of days, I've learned about Parodinal . Sodium sulphite, paracetemol, and ffs, caustic soda. I am writing this whilst waiting for the safety glasses and nitrile gloves to arrive in the post so that I can make up a batch. What larks!