[alt-photo] Re: Chlorox Bleach Development of Gum

[Paul Viapiano]

So...I am guessing/inferring that this non-bleach/alkalinity method would 
work for doing gumoils as well???

p



----- Original Message ----- 
From: "Dave S" <fotodave at dsoemarko.us>
To: "'The alternative photographic processes mailing list'" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Wednesday, January 13, 2010 1:30 PM
Subject: [alt-photo] Re: Chlorox Bleach Development of Gum


You can also try sodium carbonate (washing soda) if you want to.


Dave

> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org]
>  On Behalf Of Loris Medici
> Sent: Wednesday, January 13, 2010 2:55 PM
> To: The alternative photographic processes mailing list
> Subject: [alt-photo] Re: Chlorox Bleach Development of Gum
>
> Just noticed: I guess sodium bicarbonate also is a household
> item, plain simple baking soda right? ;) It's worth a try...
>
> 2010/1/13 Loris Medici <mail at loris.medici.name>:
> > Thanks for the insight. I haven't tried any other alkaline compound
> > with gum but I know ammonia is useful for trigger/accelerate
> > development in casein + was once advised for stubborn gum
> layers too,
> > so I think you're on the right track. OTOH, bleach is easy to find
> > (household item), plus, we don't use it that much; only about 20 -
> > 40ml per liter. And, a final metabisulfite clearing bath will take
> > care of the bleach remaining in the paper - if any - later...
> >
> > Regards,
> > Loris.
> >
> > 2010/1/13 <pfriedrichsen at sympatico.ca>:
> >>
> >> Has anyone tried using an alkaline bath instead of the bleach?.
> >>
> >> I haven't tried the bleach development but I have been
> working with "gum"
> >> subing gelatine, or casein, and the print clears more
> readily as the
> >> developer is made more alkaline. Salts I use are Sodium
> Bicarbonate
> >> for a mild alkaline solution pH of about 8, or Sodium
> Carbonate with
> >> a solution pH of around 10.
> >>
> >> A dilute bleach solution that I made up using about 200 ml
> water to
> >> 20 ml household bleach gave me a pH of 11.2. This is very
> alkaline.
> >> From what I understand, an alkaline pH changes the charge of
> >> particles and cellulose, so they start to repel each other
> hence the alkalinity of most detergents.
> >>
> >> This would be good because it would avoid the use of hypochlorite
> >> which is hard on cellulose fibers. This is just a hunch.
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