[pure-silver] Re: Phenidone in propylene glycol vs glycerin
- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 19 Feb 2010 09:22:52 -0400
DEAR BILL,
Excellent results with 90% isopropyl. Any chance 98% pure
ethanol (ethyl alcohol) would work dissolving and storing phenidone? It is
easier for me to get 98% ethanol than it is 90% isopropyl! Comes from
living on a rum producing island!
CHEERS!
BOB
_____
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Claudio Bonavolta
Sent: Thursday, February 18, 2010 4:03 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Phenidone in propylene glycol vs glycerin
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 bo! th 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 o! f you already tried both products ?
> What is your preferrence and why ?
>
> Thanks in advance,
> Claudio Bonavolta
> http://www.bonavolta.ch
>
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