[pure-silver] Re: Phenidone in propylene glycol vs glycerin
- From: BILL WILLIAMS <krbill_10@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 19 Feb 2010 08:29:14 -0800 (PST)
I must make a correction to a statement about the phenidone in alcohol. I'm
getting old, and I have many distractions to boot...
I do not make a 25% solution and then cut it further to a 10% solution. What I
do actually mix is as follows:
10 grams of phenidone is mixed into 250ml of 90% isopropyl alcohol to make a 4%
solution. I store the mix long term in this form. From the 4% solution, I mix
down further to a 1% solution, which I believe is 25ml of the 4% phenidone
solution further mixed with 75ml of 90% isopropyl alcohol. It is the 1%
solution with which I work to make the film or paper developers. I realized
my mistake when looking for the phenidone/alcohol articles by Pat Gainer.
Sorry...
--- On Thu, 2/18/10, Claudio Bonavolta <claudio@xxxxxxxxxxxx> wrote:
> From: Claudio Bonavolta <claudio@xxxxxxxxxxxx>
> Subject: [pure-silver] Phenidone in propylene glycol vs glycerin
> To: "Pure-Silver" <pure-silver@xxxxxxxxxxxxx>
> 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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