Originally posted by Jlnk Wow. Don't blast that into a bottle of developer. Don't, just don't. Most canned "air" is something like difluroethane, sure its more dense than air at STP, and generally non-reactive, but considering the trouble one would have to go to top of a bottle with it in a way where you could be sure you were actually excluding the oxygen in the room, it seems unnecessary. Not to mention the potential of blasting developer out of the bottle and all over the room if you squeeze the trigger a touch to hard.
But then I never understood the appeal of accordion bottles either, at least not when $5.00 will buy a few hundred glass marbles.
What a pile of dung. You don't have to exclude the air, you need a layer of gas on top of the developer, nothing more. This is a technique I used for some 4 decades in the darkroom to extend the life of developers. It's safe, it's efficient, and it works.
You seem to think that the only way to use canned gas is a full strength blast.
You are ignorant, very ignorant.
And you are giving bad advice on the internet.
Don't ever try to day ANYTHING that requires even a remotely gentle touch. You sound like you don't have the self control for it.
Man, oh man, there is nothing like a good dose of hysteria on the internet.