Crystalized Rodinal
Old 02-21-2016   #1
Tijmendal
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Crystalized Rodinal

My Rodinal has gotten chunky. When I turned it upside down there was just some crystalized stuff stuck on the bottom. When I shook it, it fragmented. I don't trust it anymore, so I bought a new bottle, but I was wondering what could have caused it. Any leads?
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Old 02-21-2016   #2
Timmyjoe
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I guess it's caused by evaporation or something. Been using Rodinal for over twenty years, have had that happen numerous times with different bottles. I just shake the bottle up to see if they dissolve, and if it gets too bad I will pour from one bottle to another through a strainer & coffee filter.
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Old 02-21-2016   #3
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Quote:
Originally Posted by Timmyjoe View Post
I guess it's caused by evaporation or something. Been using Rodinal for over twenty years, have had that happen numerous times with different bottles. I just shake the bottle up to see if they dissolve, and if it gets too bad I will pour from one bottle to another through a strainer & coffee filter.
Thanks. But wouldn't it make the solution less strong?
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Old 02-21-2016   #4
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Had the same thing happen to my last bottle but just kept using it ... it was fine.
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Old 02-21-2016   #5
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Quote:
Originally Posted by Keith View Post
Had the same thing happen to my last bottle but just kept using it ... it was fine.
I'm a little afraid that the crystals will end up touching the negative and leaving some kind of mark (like gross overdeveloping or something).
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Old 02-21-2016   #6
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Quote:
Originally Posted by Tijmendal View Post
I'm a little afraid that the crystals will end up touching the negative and leaving some kind of mark (like gross overdeveloping or something).
I would just let the stuff settle after giving it a shake then draw off what I needed with a syringe, making sure not to draw from the bottom.
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Old 02-22-2016   #7
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This topic was discussed some time ago in another thread and I learned that the crystals come from recrystallisation of the p-aminophenol. It was also said that the recrystaliation does not exhaust enough p-aminophenol to influence the activity of the developer.

I regulary use paRodinal, and the crystals are also there. I never saw a problem with it, I just ignore them until the concentrate level is very close to the bottom of the bottle.

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Joao
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Old 02-22-2016   #8
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Keep using the old one for less critical work. It's cheap; if you are worried just dump it.
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Old 02-24-2016   #9
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Are we talking about the original Rodinal?

I have been using Fomadol R09 and heard that it is more sensitive and does expire. I kept it outside in hot summer and I am worried if it is done now. It has been 2.5 years since I bought it.
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Old 02-25-2016   #10
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Quote:
Originally Posted by Tijmendal View Post
My Rodinal has gotten chunky. When I turned it upside down there was just some crystalized stuff stuck on the bottom. When I shook it, it fragmented. I don't trust it anymore, so I bought a new bottle, but I was wondering what could have caused it. Any leads?
Do not worry. In most cases, darkening of the solution and crystals do not influence the developing capacity. Dab a bit of the concentrate on a piece of unexposed film.The film will become black in some seconds, if your Rodinal is healthy.

You can filter your developer through cotton wool. Put some cotton wool into a funnel and pour the Rodinal through it.
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