I recently started developing film at home again, after a long time away from it. I wanted to get images as grainy looking as possible, and on the advice of the lab technician at
John Gunn's in Dublin i developed a couple of rolls to her instructions ie use paper developer, 4/1 for 4 minutes, regardless of the film type or speed. Surprise surprise, I'd labelled some old films wrongly and so went ahead and accidentally double exposed them.