[pure-silver] Re: Mixing

Part B for PMK is sodium metaborate and Part B for Pyrocat HD is pot carbonate.

lee\c


At 03:05 PM 9/16/2005, you wrote: 
The solution is very concentrated, I believe that it
is the same as the part B for PMK pyro, which I mix up
and use.  Using warm water helps, although if the
water is too hot, then you get a white precipitate
which will not redissolve.  You can mix it with twice
the water, and then use twice as much when mixing the
developer - since pyro is usually very dilute, this
works well.



--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:

>
> ----- Original Message -----
> From: "titrisol" <titrisol@xxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Friday, September 16, 2005 12:07 PM
> Subject: [pure-silver] Re: Mixing
>
>
> > That is quite concentrated... can you make a half
> strength
> > solution and then use double of wht is required?
> > My guess is that you'll have to use warm water
> (60-70C) to
> > dissolve so much carbonate.
> > Besides, if my Handbok of CHemistry and Physics is
>
> > correct,
> > solubility should be aorund 46g/100 ml !!
> >
> >
> > --- Camclicker@xxxxxxx wrote:
> >
> >> I am going to mix up 100 mL of Pyrocat HD and
> solution B
> >> calls
> >> for  75g
> >> Potassium Carbonate to be mixed with 70 mL
> distilled
> >> water and
> >> topped  off to 100
> >> mL..
> >>
> >> The last time I tried mixing this dense a
> solution (84g
> >> Sodium
> >> Carbonate to
> >> 100mL water) I ended up with a glob of unusable,
> moist
> >> Sodium
> >> Carb.   Will the
> >> Potassium behave the same way as the Sodium, if
> so is
> >> there a
> >> trick to
> >> mixing dense solutions?
> >>
> >> Bruce
> >> Brooklyn, NY
> >> camclicker@xxxxxxx
> >> www.camclicker.com
> >>
>    I wonder what form of carbonate was specified in
> the
> _original_ formula. In the US carbonate is usually
> either
> anhydrous or monohydrated but many English formulas
> specify
> crystaline carbonate. If the original formula was
> written
> for crystaline carbonate and that specification got
> lost
> somewhere it could explain the problem.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
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