I apologize in advance if some of this stuff has been posted previously. My school (OCAD) doesn't seem to have a place to develop C-41 on our own, just B/W film. So being the curious child I am, I wanted to find out how to do it myself. I read through many threads here and was inspired to DIY my own colour film. I already know the process. I have the paterson tank and reels. Probably will order the Tetenal 1L Press kit for now and see how that works out. My only concern is chemistry life. I'm only comfortable doing 1 roll of B/W at a time right now, so the same goes for colour. I know C-41 chemistry goes bad fast, though I've seen people extend chemistry life with tolerable results. I'm willing to tolerate colour shifting and all that. This is just me being experimental Should I mix ALL the chemistry or just a little? The tetenal instructions tell you how to mix the whole 1L but I don't think i want to do that. How would I mix lesser quantities? Just use less powder/water? I'd say I'll be doing 3-4 rolls a month to start things off. Then maybe after a dozen rolls, mix a fresh batch. So what's the best and cheapest way to store the chems so that they are airtight? It's not absolutely critical for me to get the perfect results like you would from the lab using flexicolour, so I don't care if the chemistry slowly expires. I just don't want my chemistry to drop dead fast. I'd say I plan on using this for 6-8 months. Thanks!