Phenidone how can you tell if it has lost its potency?

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Vetus

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BHuij said:
Bummer, but sure better to find out like this than losing an important roll of film.
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Agree lesson learned, in future I will only buy from reputable chemical suppliers or buy manufactured brews off the shelf. The big auction sites can be a lottery.
 
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Vetus

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Andrew O'Neill said:
I've got some old stock that has turned gray. It's working fine.
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I was sold a poor imitation of phenidone, the seller has withdrawn it from Ebay. I never got a refund or compensation from Ebay as they could not accept my explanation of why the phenidone was substandard. The seller bluntly refused to accept that his phenidone was either substandard or impotent.
 

Ian Grant

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It may be the seller was deceived as well. However, it should have been tested, at least practically.

Ian
 

Andrew O'Neill

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Ian Grant said:
Well, you've turned . . . . . . . but so have many others of us without realising

But at least you keep your trousers on, and turn out fine work.

Ian
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Sidd

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@Ian Grant and @Alan Johnson asking you both whether any of you have ever tried Patrick Gainer's 2009 formula of a easy PC-borax developer? That's another easy to make developer formula. If it works then it would be wonderful!
 

Corn_Zhou

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Ian Grant said:
I mixed up some print developer and compared it to a larger batch with much fresher Phenidone. Not very scientific but there was no apparent difference. I bought it in 1977, the Ilford code indicates manufacture was 1961.

Oan
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BTW, is Phenidone S supposed to be orange? I made a 1% solution in glycol and the solution is orange too. This Phenidone S does work but why the color? Maybe impurities or partially oxidized?
 

Sidd

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Corn_Zhou said:
BTW, is Phenidone S supposed to be orange? I made a 1% solution in glycol and the solution is orange too. This Phenidone S does work but why the color? Maybe impurities or partially oxidized?
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I can share my experience with Phenidone A, 5% solution is golden yellowish, 1% is very light yellow. And, 5% Dimezone S has pinkish orange colour. All the solutions are in propylene glycol.
 

john_s

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Corn_Zhou said:
BTW, is Phenidone S supposed to be orange? I made a 1% solution in glycol and the solution is orange too. This Phenidone S does work but why the color? Maybe impurities or partially oxidized?
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Does the term "phenidone S" mean Dimezone-S?
I bought some that had just arrived in Australia in a 50kg drum, so I assume it was fresh. It is a pale orange colour. I have some phenidone, presumably phenidone A which is snow white. These are the colours of the powders, not solution.
 
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