I developed with Caffenol for the first time tonight, using the Delta Standard recipe I found online. Developing went fine. I had a bit of trouble loading the film, but I got it.
The problem happened with the stop bath. I poured the Caffenol down the drain, didn't wash the tank, then poured inside it what I normally use as a stop bath, which is citric acid (I've always developed with D-76 before, and had no problems using it).
I started to agitate and noticed the tank got stuffed, as if it were filling up with air, like a balloon. I agitated once more and it almost exploded. The lid simply sprung open. Luckily, I was agitating in the bathroom and didn't mess anything up with the liquid that leaked, but I got fogs/light leaks on my negative, and I'm thinking it had something to do with this.
I was wondering what might have caused that?