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  #1  
Old 3rd April 2022, 09:21 PM
Nat Polton Nat Polton is offline
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Default Rodinal Sediment

Although I have never had a bottle of Rodinal long enough to deposit a sediment in the bottle. I was wondering if a sediment does occur, do you just decant the developer from above the deposit or give the stuff a jolly good stir to get it back into solution?

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Old 3rd April 2022, 09:53 PM
Mike O'Pray Mike O'Pray is offline
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Nat, I have a bottle that is about 16 years old and I used it quite recently- maybe 4 months ago. When I poured it out there was no sediment but as the bottle is white plastic it may be that there is a solid sediment in the bottom that remains solid and I just can't see it

I note that paddy in another thread has a bottle 18 years old which is still effective. Maybe he will say if his throws a deposit

Mike
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Old 3rd April 2022, 10:14 PM
Michael Michael is offline
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Nat, your post stirred my memory and I did a forum search on "crystals Rodinal". This interesting thread came up.
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Old 4th April 2022, 12:26 AM
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Reginald S Reginald S is offline
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I bought my Rodinal in canisters of 3 Liters each.
At this time Tetenal produced the Rodinal like the times before.
So names like R09, real Rodinal, more real Rodinal or Fantasticonal did say nothing except all has been the same basic stuff from Tetenal.

Building up Crystals over some month has been typical to my charges; sometimes less, sometimes more.
I didn't care and my developer worked fine.

The last canister I have bought approx. 4 to 5 years ago, probably 5 years.
I opened it last year after a long darkroom break, I didn't care about some chrystals - and it developed busy as usual.
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Old 4th April 2022, 05:32 AM
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Uwe Pilz Uwe Pilz is offline
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Rodinal contains caustic potash. With the carbondioxide of the air it changes to potassium carbonate which is far less soluble. This are the crystals at the bottom.
Rodinal is fine wven with that crystals and oes not need decanted. However, I always discard the very last drops in a bottel around 20 ml of a half liter bottle. May be this is superstition ...
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Old 4th April 2022, 04:20 PM
Martin Rick Martin Rick is offline
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I recently had a 100ml bottle of Foma's R09 go bad on me and completely lacking any development activity. On dilution a flocculent precipitae was produced and on rinsing the bottle out, a thick crust of crystalline deposit was apparent.
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Old 4th April 2022, 04:36 PM
Terry S Terry S is offline
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Default Disposing of 'dead' Rodinal...

Quote:
Originally Posted by Martin Rick View Post
I recently had a 100ml bottle of Foma's R09 go bad on me and completely lacking any development activity.
Which reminds me, I have a lingering 500ml bottle of Rodinal on my shelf that died on me as well and double checking it with a few film leaders, this diagnosis was confirmed.

Does anyone know the best and safest way to get rid of it, other than in small amounts down the toilet?

Terry S
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Old 4th April 2022, 05:59 PM
Richard Gould Richard Gould is offline
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The last pack of RO9/one shot, a soft pac, I had over 2 years and used down to the last drop, some crystals in the bottom, bu7t I crushed them in the pack and they worked fine, I now have a bottle of Adox Rodinal, which I have used before, and I have used Rodinal supplied in glass bottles, not much in the bottle but enough for 5 0r 6 films, again with crystals in the bottom of the bottle, it was black as tar, but again I crushed the crystals when they came out and again as good as fresh rodinal, they only version I personally found that died on me was the old formulation from Adox, APH09, never got beyond 1/2 a bottle
Richard
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Old 5th April 2022, 02:16 PM
Nat Polton Nat Polton is offline
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Thank you all for the information.
The link to pentaxpete was a bonus.

Cheers.
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