replenishing hypam?

[timeUnit]

Hi!

I'm using Hypam 1+4 for film fixing. I have a 1,5 litre bottle of working solution that has fixed 31 films (120 and 135), and now the clearing time is up to 3 m 30 sec. It's time to toss the fixer or replenish it. Looking through the Ilford info sheet for Hypam does not make me understand how I should go about the replenishment. It says "Replenishment ml of working strength fixer" and "45 ml/135-36" for "General purpose film". What does that mean?

Any tips?

[Tom Hoskinson]

I assume that it means you should add 45ml of full strength Hypam to the working strength fixer for each 36 exposure roll of 35mm film that you have fixed in the working strength fixer: Recall that one roll of 120 film contains approximately the same film surface area as one 36 exposure roll of 35mm film.

[dancqu]

Hi!
I'm using Hypam 1+4 for film fixing. I have a 1,5 litre
bottle of working solution that has fixed 31 films (120
and 135), and now the clearing time is up to 3 m 30 sec.
It's time to toss the fixer or replenish it.
Looking through the Ilford info sheet for Hypam does not
make me understand how I should go about the replenishment.
It says "Replenishment ml of working strength fixer" and
"45 ml/135-36" for "General purpose film".
What does that mean? Any tips?

That is another one-size-fits-all recommendation. Of course
add 45 ml of fresh working strength for each additional roll
of whatever film you are using. You'll likely pour off some
of the original to maintain the same volume of solution.

According to Ilford, a liter of concentrate is good for
120 rolls of film. With a little margin that is 9 ml per roll
or 45 ml of working strength. But Ilford is averaging.
I don't think any of this group using fixer one shot
would use so little. I've used as little as 15 ml of
concentrate on a roll of Delta 3200 but saw a
very slight pink was left.

My personal one-size-fits-all is 20 ml. That much will
fix any 120 roll of film even if worst case, unexposed.
The dilution is 1:24 with a solution volume of 500 ml.
Used one-shot I've archival results with one fix. Dan

[psvensson]

I don't think replenishing is a very good idea for fixers. When the fixer is nearing exhaustion, you not only need more fresh thiosulfate in the solution, you also want to get rid of dissolved silver complexes that could compromise the archival process. Several authorities say fixer should be discarded long before exhaustion if you're concerned about archival life.

[Tom Hoskinson]

I don't think replenishing is a very good idea for fixers. When the fixer is nearing exhaustion, you not only need more fresh thiosulfate in the solution, you also want to get rid of dissolved silver complexes that could compromise the archival process. Several authorities say fixer should be discarded long before exhaustion if you're concerned about archival life.

I also believe that replenishing fixer is a bad idea - for film fixing, I use an Ammonium Thiosulfate fixer as a one-shot.

For Fiber paper fixing I use a 2 bath Ammonium Thiosulfate fixer system.

If a single bath is used for Fiber Paper fixing it can form insoluble (or relatively insoluble) silver complexes - bad for archival processing purposes.