From: Cactus Cowboy (cactus@tritel.net)
Date: 04/08/02-07:34:50 AM Z
I'm using Rives BFK for gum and cyanotype printing. To prepare the paper
(after preshrinking in hot water), I soak it in a shallow tray of gelatin
solution for about 5-10 minutes. I then pull the paper through a gap
between two wooden dowels, at an oblique angle, this having the effect of a
squeegee, removing excess gelatin. The paper is hung from a line to dry,
and then soaked in gelatin a second time and dried. The final treatment is
in formaldehyde solution, to harden the gelatin. I do not have problems
with air bubbles using this method.
Best regards,
Dave in Wyoming
----- Original Message -----
From: "Witho Worms en Jorien van Santen" <verzet13@xs4all.nl>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Monday, April 08, 2002 7:09 AM
Subject: gelatin coating
> I have two questions concerning the coating of gelatin on papers.
> First : Last night I tried to coat Rives BFk with a 5% gelatin/ 1%
> aluminiumpotassiumsulfate solution. I coated the papers with a hake brush.
> The paper should be used for carbon double transfer or, after some extra
> coats, as an oilpaper. Very tiny bubbles now show as little shiny specks.
> Will these specks harm the final print ? or should I use those papers just
> for tests ? Is there a remedy against these specks or bubbles ?
> I have the impression that the alum creates more viscosity in the gelatin
> and is therefore harder to coat. Is it not simpler to give a paper coated
> with a plain solution of gelatin a hardening bath afterwards (I am
thinking
> about carbon now) in formaline or glyoxal?
> Second question : Nze Christian wrote that Rifes BFk can be made suitable
as
> a platinum paper by coating it with a 1% gelatin/1% alum/1% oxalic acid
> solution. Why is there need for the alum ? Why should the gelatin get
> hardened ?
>
> Witho
>
This archive was generated by hypermail 2b30 : 05/01/02-11:43:29 AM Z CST