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Old June 29th 09, 09:56 PM posted to rec.photo.darkroom
Thor Lancelot Simon
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Posts: 163
Default Bad E-6 5L kits circulating?

In article m,
David Nebenzahl wrote:
On 6/29/2009 1:43 PM Thor Lancelot Simon spake thus:

I have ordered 30L worth of wide-mouth thick square HDPE
bottles from McMaster-Carr and will just devote the freezer
in my darkroom fridge to E6 chemistry mixed as full kits
of working solutions in .5L or 1L bottles.


Just a small note: I thought I'd read that PETE is less permeable than
HDPE, and therefore better for storing photo chemicals. Could be wrong
about that, but if not, maybe you'd want to rethink your storage containers.


I believe you're right -- it is less permeable. But these bottles are
quite thick, and they're square -- I couldn't find square PETE bottles
of the right size at a tolerable price. I think the wall thickness
and the low temperature will adequately deal with oxidation.

I've been freezing C41 chemistry in Jobo bottles, which are thick HDPE,
for a while now, and it's worked well. I considered glass bottles,
which are cheaper still, and of course completely impervious to air,
but I don't want to risk a glass bottle full of some nasty organic
compound like E6 reversal bath bursting in the freezer if I overfill
it slightly.

--
Thor Lancelot Simon
"Even experienced UNIX users occasionally enter rm *.* at the UNIX
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