Re: Glyoxal?

Loris,
In my practice tere is very little difference after water wash. It is very,
very faint grey I wisj I could quantify it better). If my highlights were
that clear after multiple gum printing I would be very happy. I alway use
sodium metabisulfite clearing bath as a last step to clear the dichromate
stain anyways, so I did not bother to include the extra step during the
siezing process, nor that the barely visible grey would warrant that in my
opinion. My chromium concentration is very low for the siezing.
Marek

>From: Loris Medici <loris.medici@altinyildiz.com.tr>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: Glyoxal?
>Date: Tue, 17 Jan 2006 22:19:18 +0200
>
>Marek, do you use any clearing agent for gelatine/dichromate size? I
>noticed the paper base warms when sized with this combo... I rinsed the
>sized papers for about 1 hour, yet there was a pretty perceptible
>difference between the sized and unsized paper base.
>
>Regards,
>Loris.
>
> -----Özgün İleti-----
> Kimden: Marek Matusz [mailto:marekmatusz@hotmail.com]
> Gönderilmiş: Sal 17.01.2006 18:56
> Kime: alt-photo-process-l@sask.usask.ca
> Bilgi:
> Konu: Re: Glyoxal?
>
>
>
> All,
> I would add even one more factor to this glyoxal issue and gum
>observations
> in general. Most of the observations are not made with scientific
> instruments, where the readings are objective from place to place. They
>are
> made by looking at, feelingt the samples, etc, very objective tests in
>their
> nature. For example what Katharine might call a non-yellowing glyoxal
>siezed
> paper might be a slight yellow tint to Chris. When I first used glyoxa /
> gelatine mix I decided I got no yellow stain, later I changed my mind and
> said that slight yellow stain was observed. I rinse my papers the day
>after
> they are sized, which keeps tha papers white and pre-shrinks them at the
> same time. I am still experimenting with the most conveniet way to sieze
>the
> papers for gum.
> I have been experimenting with gelatine/dichromate with quite good
>results.
> Marek, Houston
>

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Received on Tue Jan 17 17:46:24 2006