Ah ha! Good plan Sherlock! Thanks a lot Ian.
Chris
On 23 Apr 2004, at 12:06, Ian Nichols wrote:
>
> Now that the fault has been identified as oxidised developer, I
> thought I'd
> just stick my hand up and repeat my observations on keeping the stuff
> stored for long periods. The key is to keep oxygen away from the
> liquid,
> the problem is how to do it.
>
> Squeezy bottles work to some extent but you can still trap some air
> inside,
> and they'll be trying to expand all the time, possibly sucking more
> air in
> if there's the slightest lack of air-tightness.
>
> I've found it's much better to displace the air above the liquid with
> some
> sort of inert, or at least non-oxidising gas. Ideally, one which is
> significantly more dense than air (rules out nitrogen - that's slightly
> less dense).
>
> Argon is perfect for the job, but unless you do a bit of welding you're
> unlikely to have easy access to it. Fortunately, there's a readily
> available, inexpensive alternative: butane. That's right, gas lighter
> fuel. It's more dense even than argon, so it just sits on top of the
> liquid, keeping any leftover air away. It's not even as big a fire
> hazard
> as you might think, just keep away from flames & don't smoke whilst
> you top
> up your developer bottles before you seal them again.
>
>
> ----------------------
> Ian Nichols, School of Chemistry
> I.A.Nichols@xxxxxxxxxxxxx
>
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C M I Barker
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