I'd assume that would be the case. I still can't understand your "Five Litre Death Syndrome" though. For quite a few years now I've made up 5 litres of stock and diluted it to working strength as I needed it. Probably takes me anywhere between 2 and 6 weeks to use up - and over that period the container is increasingly "not full". Never had an issue. Thought I did once - but it was a roll of TMX I'd inadvertently exposed at EI 6400!! Couldn't blame anyone for that. But obviously from this thread it's not just you.