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How many times can you replenish?

D-94

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#1 Michael Carter

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Posted 04 December 2017 - 08:02 AM

D-94 has been mixed and used successfully on 16mm 7266, once, then re-used over again, but with some added time. It worked. Replenisher could have been used instead of adding time. But how many times? How often can a batch of developer be reused?
Thanks.
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#2 Simon Wyss

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Posted 04 December 2017 - 08:38 AM

It’s not the developer you have to keep an eye on but the reaction products from the film. Most black and white stocks give off bromides, they’re actually dissolved out by the developing bath. Time after time you have more bromides in the bath braking the process. You replenish the reducing agents and the alkaline and or buffer but don’t remove the byproducts. So there’s a limit to it.

 

When I worked as a developer (not as an agent) with a commercial movie film lab in the 80s I was the one who got the dirty job of cleaning the machine’s developer tank. That tank took 800 liters or 211 gallons, a Photomec ECP processor. With a warm solution of hydrochloric acid under light pressure out a hose I sprayed down the walls and bottom of the SS container, goggles, breathing pad, plastic gown, rubber boots, gloves. Admitted, color positive film is something different from black-white stocks, but you get the point.


Edited by Simon Wyss, 04 December 2017 - 08:39 AM.

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#3 Michael Carter

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Posted 04 December 2017 - 09:48 AM

Yuk!
The first developer turned brown after one use, then darker after the second. No replenisher had been used.
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#4 Simon Wyss

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Posted 04 December 2017 - 11:00 AM

D-94 is a machine replenishment formula. There you are.

 

7266, Kodak Tri-X reversal film, could become your second choice once you’ve projected a true reversal film such as Fomapan R that has a colourless base. You do know Fomapan R, I presume. The next step to perfection might be the negative-positive process using a print stock having a colourless base as well. ORWO PF 2 plus and PF 2 Version 3 have an antihalo undercoat. Kodak don’t have anything the like.

 

Yet another step would be to try microfilms.


Edited by Simon Wyss, 04 December 2017 - 11:00 AM.

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#5 Michael Carter

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Posted 04 December 2017 - 11:44 AM

Fomapan R regular 8 is how I began developing movie film. Their kit was used first then LQR. I used un54 also. Not in 16mm though. I want print stock but have not tried to get any yet.
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#6 Michael Carter

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Posted 04 December 2017 - 02:23 PM

When replenisher equals original volume then dump it all out. That answer from, https://www.facebook.../?ref=bookmarks

Edited by Michael Carter, 04 December 2017 - 02:27 PM.

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