BVStaples wrote:
Greetings all:

I recently picked up a Polaroid 545 and some film, along with the
requisite sodium sulfite and other goodies, and I have some questions
about the sodium sulfite, but cannot find the answers anywhere!

First, is whatever I put in the tray a one-shot use, or can I use the
same solution for multiple negatives? How do I know when it's
depleted? If it's a one use situation, so be it. I do plan on shooting
and then coming home to process, rather than develop in the field.

When you use it, scuzzy stuff comes off the negative, that usually settles
to the bottom. But not all of it. Eventually, it may redeposit on the
negatives. Just before that happens ;-) , replace it. I would not keep it
over a day because the stuff oxidizes into sodium sulphate that is less useful.

Second, once used, what's the proper disposal method? I have friends
who pour everything down the drain, and then those who recyle
everything.

Dumping it down the drain increases the oxygen demand of the effluent, but
home users probably do not dump enough that the sewage treatment plants
would even notice.

It is technically non toxic, but I strongly advise against drinking it.
Causes asthma attacks in some people, and IIRC, you can turn blue if you
drink enough of it. Recall that even table salt will kill you very soon if
you consume too much of it. The dose makes the poison.

Thanks in advance.

Brian



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