Caffenol is a pretty popular technique, you can find many detailed posts online comparing it with other developers. I've used it a few times in a pinch when tr

Caffenol is a pretty popular technique, you can find many detailed posts online comparing it with other developers. I've used it a few times in a pinch when traveling, it's nice. Unfortunately I've never been able to find a fixer formula that's as easy/off the shelf.