Rodinal precipitate

Philippe-Georges

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Last night I developed a FOMAPAN 400/120 at 1600ASA in Rodinal 1+50 for 25 min 20°C (see the massive developing chart).
As advised by Patrick Gainer, I added 1 gr/litre Borax to the work dilution (*).
The results ware not that good but usable. It looks under developed but it might be poorly exposed as the pictures were shot in extremely poor light conditions (hence the 1600ASA).

(*) Concerning the Borax, I took the liberty to attach a nice text written by Patrick Gainer about his vision on Rodinal.
I must admit that I learned a lot from his vision and knowledge he broadcasted in his every comprehensive and pleasant to read writings.
I hope that by doing this I don't violate the rights of Patrick Gainer!
 

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  • ADDING BORAX TO RODINAL.pdf
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Alan Johnson

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I don't believe Gainer ever wrote up his Rodinal/sodium ascorbate/ borax formula with quantities all in one place.
This seems to be the nearest:

Rodinal Substitutes?

Gerald, please note the fact that bromide was added to Rodinol when they stopped using the hydrochloride salt of the pAp. This event is not insignificant IMHO. PE I think that may be a coincidence since chloride ion is such a feeble restrainer.
www.photrio.com
The borax addition is to stop the ascorbate from causing fog at the pH of Rodinal.
 

JPD

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eli griggs said:
As I understand this and parodinal is that the crystals that form on the bottom the bottle, should be left in the solution.
Click to expand...
That's my understanding as well, and that decanting might affect the longevity in a negative way.
 

Philippe-Georges

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JPD said:
That's my understanding as well, and that decanting might affect the longevity in a negative way.
Click to expand...

I only decant when mixing the concentrate in the water to make the work solution, the crystals remain in the bottle of course.

I have been rummaging in my computer and found the pdf with the whole text by Patrick Gainer, dating from 2006 the year after AGFA's demise, here is the full original text.

Please, and I do insist, don't see this as an idolatry!

Along this search, I found a text coming from the Photographers Formulary on their Rodinal, I show it here in a manner of additional information, and that's why I add a text about the Paracetamol developer too, which could be considered as an Rodinal alternative.

PS: BTW, Mr. Alan Johnson, I don't understand what you don't believe about Patrick Gainer, may ask for some enlightenment please?
 

Attachments

  • ADDING SODIUM SULFITE TO RODINAL.pdf
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  • PHOTOGRAPHER'S FORMULARY RODINAL.pdf
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  • PARACETAMOL DEVELOPER.pdf
    28.8 KB · Views: 121

Alan Johnson

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Your link "Adding sodium sulfite..." comment 2 gives the amount of sodium ascorbate to be added. It is the definitive article I could not find, what was the source?
The history of Parodinal is now lost due to broken links:

Potassium Hydroxide in Parodinal?

I just ordered some R09 (Rodinal) from Freestyle and the invoice says "Potassium Hydroxide". All of the Rodinal formulas I have specify Sodium Hydroxide. I have potassium hydroxide, which apparently can be shipped easily (at least within the states) but DEA forms are required to sell/ship...
www.photrio.com
But your link "Paracetamol developer.." was early work on this.
 

Philippe-Georges

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I don't recall the source as it is nearly 16 years ago...
I downloaded the article, at the time and saved it as a pdf, what I always do with documents I want keep for long and eventually print them..
 

Alan Johnson

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Looks like you rescued Gainer's ascorbate addition to Rodinal formula from disappearing.
Regarding the crystals deposited I believe:
(1) Rodinal very slowly deposits potassium aminophenolate , probably a supersaturated solution.
(2) PaRodinal deposits sodium sulfite in the short term as the specified amount exceeds the solubility of sodium sulfite at room temperature. In the long term it may deposit sodium aminophenolate as well, may be supersaturated.
 

Philippe-Georges

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Perhaps it can be put amongst the other formulas on this forum?
 
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