Why the time differences between Ilford and Kodak rapid fixers?

[dancqu]

It has always seemed to me that a sensitive enough silver
ion test for the fixer would be the most accurate method
of determining when the solution should be discarded.

It looks like I'll just keep doing what I've been doing.
Best, Doremus Scudder www.DoremusScudder.com

I did play some with the FT-1 test. That is the potassium
iodide drop wise titration of used fixer. I found though that
at very low silver levels the end point of the titration was
indeterminate. Very slowly as the test solution was
added drop by drop an almost invisible
precipitate appeared.

I consider the clip test a valid test. Unlike counting the
number of sheets or square footage the clip test is a test
of the fixer. Out of curiosity and additional assurance you
might keep track of the number of 8x10 equivalents put
through a certain volume of fixer. Remember the 0.08
grams of silver per 8x10. That's worse case, no
image silver.

It would be interesting to know how the two
tests compare. Dan

[Curt]

If you leave out the hardener, part B, in KRF then what do you have and what will work to perfection in it? I still have my 5 gallon kit, I bought and use TF-4 now and use it for everything, I'd use the Kodak fixer if I had a use for it otherwise it goes to the chemical disposal center in our town.

[Photo Engineer]

KRF is just fine without the bottle of hardener added to it.

It is just not a hardening fix.

PE

[Curt]

Thanks very much.