[Alt-photo] Re: Brushing gelatin on paper

[Luciano Teghillo]

Chris,

Thanks very much for the suggestions. I have sized only a small batch so I
will harden it as is and try. For the next round I will use only one coat.
My question is: how do you coat the gelatin? I dip a foam brush in the
gelatin, and put a fair amount on the paper, then I smooth it using
horizontal, vertical and diagonal strokes, charging the brush as needed.

The whole operation lasts just under or slightly more than a minute on an A4
sheet, and when I am done there is no gelatin dripping. Basically I use the
same technique used for coating the pigmented gum/dichromate but a lot more
relaxed :-)

Luciano





-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
Christina Anderson
Sent: Sunday, December 15, 2013 8:36 PM
To: alt-photo-process-list at lists.altphotolist.org
Subject: [Alt-photo] Re: Brushing gelatin on paper

Luciano,
Do NOT throw that paper. You did not size incorrectly. And, even if you did
use too little sizing as you may think, you can always use one more coating
if desired. However, I think two coatings errs on too much sizing.

Yellowing can definitely be from too much gelatin as Loris says. It can also
be from certain hardeners on alkaline paper.

I cannot see my gelatin sizing once it is soaked into the paper. It is very
hard to see. I have to actually label which side I size to see it.

Sometimes I can see a bead of glossy gelatin along the edge of the paper.

I do not use two coats of gelatin when I size, only one. Otherwise it can
get too slick and flaking can occur, but some do use two coats.

I have also been using Gamblin PVA sizing 1+2 water on Fabriano Artistico
Extra White and it does adequately well. That, too, is very hard to see on
the paper, although it is easier to feel it. It feels a bit smooth and
acrylic-y.

Chris

> 
> Since I have already wasted and entire set of Fabriano Artistico that 
> I presume I sized incorrectly, I want to make sure this time I do it 
> correctly.
> 
> Maybe is something totally unrelated to sizing. Maybe I should harden 
> the gelatin before making a comparison.
> 
> I  tried to scan the paper samples (mine and those used as a 
> comparison) it's useless. You can only see the paper ridges and 
> valleys, but nothing else.
> 
> I have posted however two images on a previous test I did. The only 
> thing different between the two tests is the paper. Everything else is 
> the same, done on the same day, developed for the same time, etc.
> 
> - http://www.lucianoteghillo.com/images/test01.jpg - This paper was 
> sized by someone else.
> - http://www.lucianoteghillo.com/images/test02.jpg - This is the paper 
> I sized on a previous batch.
> 
> Feeling frustrated....
> 
> Thanks for any help,
> Luciano
> 
> 
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