This may be a silly question, but how do you know how much gas to use? Given that it's invisible, how can you make sure that you've used enough to cover the surface of the developer?
If I understand correctly, butane is heavier than air and will settle at the surface of the liquid, forming a barrier between the liquid and the air above. So I could theoretically store any quantity, however small, of developer in a (glass) bottle, as long as I put in enough butane to cover its surface. Is this correct? But how can I tell if I've used enough (I mean, other than waiting for a few months to see if the developer goes bad
)? Is there any trick?
Thanks.
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