Re: Hypo Eliminators

• To: alt-photo-process-l@sask.usask.ca
• Subject: Re: Hypo Eliminators
• From: Sil Horwitz <silh@earthlink.net>
• Date: Sun, 26 Mar 2000 17:04:04 -0500
• Comments: "alt-photo-process mailing list"
• In-reply-to: <38DE6A2F.6706FFAF@banet.net>
• References: <4.2.0.58.20000326135006.00ce1480@mail.earthlink.net>
• Reply-to: alt-photo-process-l@sask.usask.ca

At 2000/03/26 02:51 PM -0500, Joe Arkins wrote:
>Does this mean a sodium carbonate (10%) solution used as a washing aid for 
>pyro
>negatives should not be used, because of potential harm to the image and/or
>gelatine.

Sodium carbonate is NOT "caustic soda" and has a much lower pH than the 
hydroxide. A 10% solution will not harm gelatin during short immersions, 
but you will get a safer effect with the Kodak wash accellerator, which is 
a buffered sulfite solution plus additives.

>If so, is it possible to buffer a sodium carbonate solution to avert this 
>harm,
>and if so, what would be a suitable compound with which to do so?

Yes, you could buffer the carbonate, but there would be no point, as you 
will be reducing the alkalinity, and the sulfite solutions for the purpose 
are better. That's why Kodak uses sulfite. Sulfite is the photographer's 
universal reagent!


Sil Horwitz, FPSA
Technical Editor, PSA Journal
teched@psa-photo.org
silh@earthlink.net
Visit  http://www.psa-photo.org/
Personal page: http://home.earthlink.net/~silh/ 

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  • Re: Hypo Eliminators (was: Dichromate and the plate)
    • From: Sil Horwitz <silh@earthlink.net>
  • Re: Hypo Eliminators (was: Dichromate and the plate)
    • From: Joseph Arkins <arkins@banet.net>

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