[Alt-photo] Re: Brushing gelatin on paper

Luciano Teghillo luciano at lucianoteghillo.com
Sun Dec 15 17:52:14 UTC 2013

Hi Loris,

Sorry, I meant 3%. I used 12g of gelatin in 400ml of distilled water.


-----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
Loris Medici
Sent: Sunday, December 15, 2013 6:44 PM
To: alt-photo-process-list at lists.altphotolist.org
Subject: [Alt-photo] Re: Brushing gelatin on paper

Hi Luciano, the usual size is 3%. I think you've used a too strong solution?

> On 15 Ara 2013, at 19:33, Luciano Teghillo <luciano at lucianoteghillo.com>
> Hi All,
> I have been looming in the back an enjoyed the wealth of information 
> all of you share. Of course I have not shared nothing because...well, 
> I am just getting my feet (actually my paper) wet, as you will see.
> I have a question on brushing gelatin on paper. I have prepared the 
> usual mix of 30% gelatin and kept it at about 45-50 C and brushed it 
> with a foam brush on the print side of my Fabriano Rosaspina paper.
> I brushed on two coats, after letting the first one dry for a day. 
> This morning I was getting ready to harden the paper in formalin but I 
> had the bad idea of comparing my sheets of paper with a couple of 
> scraps of papers I have from two previous workshops.
> The papers I was using as a comparison where noticeably more yellow 
> (both Fabriano Artistico, Traditional White) when looked on a light 
> table, so my doubt is that my paper did not receive enough gelatin. Of 
> course I cannot be sure because the samples I used for comparison have 
> been tray sized and not brush sized. Also, for least one, the gelatin 
> used is similar to Knox (Paneangeli for the Italians), while I used 
> Photographers' Formulary Hard Gelatin (250 Bloom).
> Also when I compare my sized paper against a sheet of the same unsized 
> paper, I cannot see any discernable difference, even under an 8x loupe.
> When brushing I load the foam brush, and move horizontally, vertically 
> and diagonally with speed (not quite the same as when you coat with 
> pigment, but almost), and make sure the brushing is uniform by looking 
> at the surface from an angle.
> Maybe I brush to fast and "pull" the gelatin too much that it does not 
> get into the paper?
> 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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