Can Hardener Be Used With Alkaline Fixer?

Mahombi · 10-03-2007, 09:35 AM

I should know this, but I don't. Can a hardener be added to an alkaline fix? If so, is there any additional info I should know, in particular, the type of hardener? I've never had the need to use hardener before, but I am about to process some Efke film, which is known to be very delicate.

Tom Hoskinson · 10-03-2007, 09:54 AM

Quote:

Originally Posted by Mahombi

I should know this, but I don't. Can a hardener be added to an alkaline fix? If so, is there any additional info I should know, in particular, the type of hardener? I've never had the need to use hardener before, but I am about to process some Efke film, which is known to be very delicate.

Yes, you can add hardener to an alkaline fixer, but hardener is not needed with most films - including Efke film. With Efke film, it is best to learn how to handle the film without damaging it. Once you have damaged the emulsion, it is too late for hardener to help.

I use a lot of Efke film (both sheet film and rollfilm)and have no problems with emulsion damage. I use an alkaline fixer with no hardener. I do use developers that tan the emulsion (Pyrocat) - - however, tanning will not heal a damaged emulsion.

Mahombi · 10-03-2007, 03:52 PM

Thanks for the reply Tom. Does Pyrocat work well with Efke 25? What dev time would you recommend?

Photo Engineer · 10-03-2007, 04:37 PM

You cannot add alum hardeners to alkaline fixes. The only hardeners that you can add are the aldehydes such as formaldehyde.

The metal salt hardeners will precipitate in the alkaline fix.

PE

Mahombi · 10-03-2007, 04:45 PM

Brilliant answer PE. You've saved me a potential headache. What dilution would you advise?

Mahombi

Photo Engineer · 10-03-2007, 06:24 PM

I would add between 1 ml and 10 ml of 37% formalin solution to 1 liter of a sodium thiosulfate fixer at pH 9. I would not add it to an ammonium hypo fixer, as it can react with ammonium ion. It is usable, but reduces the lifetime of the fixer and lowers hardening. I couldn't guess the level to add in that case.

PE

Mahombi · 10-03-2007, 07:18 PM

Many thanks PE

Mahombi

MikeSeb · 10-03-2007, 09:08 PM

Quote:

Originally Posted by Lowell Huff

Why limit your self with alkaline fixer?

In what way do you find an alkaline fixer to be limiting? Curious, not trying to be argumentative.

I've been very happy using alkaline fixers, being able to wash more quickly and do without hypo clear. I like simple....

Tom Hoskinson · 10-03-2007, 10:19 PM

Quote:

Originally Posted by Mahombi

Thanks for the reply Tom. Does Pyrocat work well with Efke 25? What dev time would you recommend?

Pyrocat works very well indeed with Efke 25. I rate Efke 25 at an Effective Film Speed of 25. I presoak in 21C water for 2 to 5 minutes and develop Semi-Stand for 16 minutes at 21 C in the 1+1+100 dilution of Pyrocat. I use a water rinse (no stop bath) and fix in a non-hardening alkaline fixer.

nworth · 10-04-2007, 03:23 AM

Another possibility is to harden the film after processing. As long as you keep the film on the reel, you shouldn't have any problems. I often use a formalin stabilizer bath after washing my black and white films. It's convenient (for the PhotoFlo), but it also does some hardening. Using SH-1 or SH-5 after a good rinse after the fix should work fine.

I remember that Ansco used to use a chrome alum hardening bath after the first developer (as a stop) to harden the emulsion of those old films before it went into the other processes for their Anscochrome color films.