[pure-silver] Re: Phenidone in propylene glycol vs glycerin
- From: Claudio Bonavolta <claudio@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 18 Feb 2010 21:03:25 +0100
Thanks bill,
That makes more than 3 years of shelf life in alcohol, that's pretty good !
Claudio Bonavolta
http://www.bonavolta.ch
----- Message d'origine -----
De: BILL WILLIAMS <krbill_10@xxxxxxxxx>
Date: Thu, 18 Feb 2010 08:03:26 -0800 (PST)
Sujet: [pure-silver] Re: Phenidone in propylene glycol vs glycerin
À: pure-silver@xxxxxxxxxxxxx
While I have no experience using phenidone in either propylene glycol or
glycerin, I do have experience with phenidone mixed in 90% Ispropyl Alcohol. I
mixed phenidone in the alcohol the first time back sometime around early 2004.
I made a 25% solution to begin with, in a 250ml medicine bottle. From this 25%
solution, I make a 10% solution in a 100ml medicine bottle. I mix formulas
from the 10% bottle, and when it is used up, I make another 100ml 10% solution
from the 25% solution bottle. It has only slightly changed color and continues
to works fine. I use it in paper formulas but it does still work just as well
in film formulas. I mixed a second 25% batch sometime around mid 2007. The
new batch I use in film formulas and it looks fine and works fine. I now have
some propylene glycol, and I plan on using it the next time I purchase
phenidone. I don't have any expectations that it will serve me any better than
has the alcohol. I would have
already used up both batches but I primarily use developers that don't use
phenidone and only occasionally mix up one with phenidone. Mixing in the
alcohol doesn't require heating the mixture.
--- On Thu, 2/18/10, Claudio Bonavolta wrote:
> From: Claudio Bonavolta
> Subject: [pure-silver] Phenidone in propylene glycol vs glycerin
> To: "Pure-Silver"
> Date: Thursday, February 18, 2010, 9:32 AM
>
> Me again ...
> Because the quantities of phenidone required in
> developers are very low and difficult to measure, many
> dissolve it in either alcohol, propylene glycol or glycerin
> at a low concentration.
> After googling, it looks like propylene glycol and
> glycerin allow a better shelf life of the solution, maybe
> with a slight advantage to glycerin but at the cost of being
> less agreable to use due to its high viscosity.
> Do some of you already tried both products ?
> What is your preferrence and why ?
>
> Thanks in advance,
> Claudio Bonavolta
> http://www.bonavolta.ch
>
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