From: Cor Breukel (cor@lumc.nl)
Date: 08/16/00-05:00:16 AM Z
Hi Joao
Your procedure seems to look ok. The ratio salt/silvernitrate is
important and Reilly advices two to three times more silvernitrate
versus salt. You are using about 6 times more, a bit too much I think.
However the first thing I would check is your hardening procedure. I
myself use a 70% isopropanol solution plus the same percentage salt as
in the coating solution.
Did you try a single coated albumen paper?
Good luck,
Cor
Joao Ribeiro wrote:
>
> Hi List,
>
> After a long time I started to print again, and my first try was with
> the albumen paper that worked very well in the past.
> I used the formula:
> Albumen 500 ml
> Glacial Acetic Acid 1 ml
> Water 15 ml
> Ammonium Chloride 7,5 g
>
> paper Canson lavis technique
>
> The paper was coated twice with albumen and hardened with a hot iron.
>
> The sensitizing was a 10% silver nitrate solution Brush applied twice.
>
> The exposure was under a vapor mercury lamp 400 w at about 45 cm height
> for 25 minutes.
>
> The problem: uneven density all over the paper.
> It looks like if the silver nitrate was absorbed more in some parts than
> in others.
>
> HELP
>
> What should I do?
>
> Thanks in advance
>
> Joao
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