From: David Foy (dfoy@marketactics.com)
Date: 02/02/03-07:35:48 PM Z
I have made and used it, experimenting with pictorial subject matter on
microfilms. The glycin dissolves in 12-15 minutes in the sulfite solution at
something like 60 deg. C or hotter.
The carbonate I use is crystal (sesquihydrate) form, not anhydrous. Crystal is
what Hubl's recipe calls for and is in fact what most if not all of the
experimenters of his era seem to have used. Off the top of my head I assume
"sesqui" indicates six, thus the equivalent to 625 grams of crystal would be 104
grams of anyhdrous.
Bill Troop writes somewhere that it's important to use the crystal form
carbonate because it has trace impurities which give it certain buffering
properties. I think that is unlikely, but would be willing to be educated by
anyone who knows.
Potassium carbonate sesquihydrate is an animal feed additive and is produced by
the megaton.
David Foy
_______________________
The Frugal Photographer
http://www.frugalphotographer.com
> -----Original Message-----
> From: Clay [mailto:wcharmon@wt.net]
> Sent: Sunday, February 02, 2003 1:34 PM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Stand Development
>
>
> Anchell and Troop write that Atget may have used Hubl paste for stand
> development, which I gather is a very thick glycin-based developer
> containing only glycin, sodium sulfite and potassium carbonate. They
> give the formula as:
>
> hot water 150 degrees: 500ml
> sodium sulfite 165g
> glycin 135g (!!!! have you ever tried to dissolve glycin?)
> potassium carbonate 625g
> water to make 1 liter
>
> Dilute 1:35 and leave for a while
>
> I'm regurgitating the book here. I've never tried it. From my
> experience, it would take about 12 hours of stirring to dissolve that
> much glycin in so little water.
>
> FWIW
>
> clay
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