Re: Gelatin Hardening

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From: nze christian (christian_nze@hotmail.com)
Date: 12/04/01-03:19:06 AM Z

Hi all,

I personnaly prefer to add the tanning agent to the gelatin solution.
I just make the sizing I need and I brush it on the paper.

For gum and carbon I use 5%gelatin/ 1% alun solution
For platinum I use 1% gelatin/1%alun/ 1% oxalic acid solution.
I almost use potassium alun

Amicalement

Nzé Christian
mailto:christian_nze@hotmail.com
http://www.c-nze.com

>From: garimo <omirag@cruzio.com>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca, alt-photo-process-l@sask.usask.ca
>Subject: Re: Gelatin Hardening
>Date: Mon, 03 Dec 2001 22:59:26 -0800 (PST)
>
> >
> >However printers of yore added chrome alum to their gelatin, I forget the
> >amount but surely in the "literature" or someone on the list will have
>it.
> >I've always meant to try it, but somehow -- I feel more comfortable
> >separating the two.
>
>I took a book along today as the truck was being tuned & the fluids
>changed... HISTORY & PRACTICE of PLATINUM PRINTING by Luis Nadeau. In
>the section on paper sizeing he says and repeats what others have
>written about Potassium Alum not being a very effective hardener and
>the use of alum being suspected of contributing to the degradition of
>papers...but not to worry because the alum is likely washed out during
>developing/clearing & washing. He says (like Liam also said today) "The
>use of Formalin also poses no problem as it evaporates on it's own
>eventually and also serves as a preservative". His reason for
>mentioning the use of Alum as a hardner was that a gelatin sizing
>hardened with formalin may be too hard to accept a platinum
>sensitzer...he suggests hardening with the potassium alum/ making the
>print/ then hardening with the formalin/and washing again.
>
>seems like more work than I plan on...
>garimo

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