Jean-David Beyer wrote:
Frank Earl wrote:

Stephan Goldstein wrote:

I'd like to start playing around with Type 55 P/N film. From reading
I know
the negatives should be cleared (per Polaroid) in an 18% solution of
Sodium
Sulfite. What I don't know is the storage life of said solution, or
how to tell
when it's dead. Or is it immortal?

Thanks all!

Steve


You may want to try plain tap water. It has worked for me just fine on
type 665 pos-neg film. Tap water here is about pH 8.5. The reason I
went with plain tap water is that I had a hard time getting 180 grams of
sodium sulfite to dissolve in a liter of water.


Wow! I wonder what is in your water. Sodium Sulfite is very soluble in water
if it is not too cold. If it is at freezing point (but not frozen) you
should be able to dissolve about 125.4 grams per litre. If it is 80 C, you
should be able to dissolve 283 grams per litre.

Calcium carbonate and a lot of stuff I really don't want to know about :).

I put the neg in a tray and ran water over it until all the gunk
dissolved away. Then soaked the negative in regular clearing solution.
Then Photo-flo and dry.