[Alt-photo] Re: Brushing gelatin on paper

[Luciano Teghillo]

Hi Loris,

I am really, really scared of formalin, so I was/am not sure if it's a good idea to pour even a small amount in the hot/fuming gelatin.
I coat twice with gelatin because in the first workshop I attended, the instructor suggested to use two immersion cycles in gelatin (the second after the first one is dried, of course), and a separate hardening bath in formalin. So I kept at it.

I was not trying to reach the same yellowing of the paper, but the fact that my paper was a lot more white, made me think I was doing something wrong, since the tests I did on papers not sized by me where OK. 

I have also tried the PVA size but did not pursue (at the time I had other issues), but if I have no luck with the papers suggested by Diana, I will give the PVA glue another shot.

Thanks,
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 Loris Medici
Sent: Sunday, December 15, 2013 8:23 PM
To: The alternative photographic processes mailing list
Subject: [Alt-photo] Re: Brushing gelatin on paper

Ok, Luciano. 3% is fine then. OTOH, why two coats of sizing and why a separate hardening bath?

When I was sizing with gelatin (I don't anymore, I use PVA now) I was doing as have described here:
http://www.dpug.org/forums/f29/sizing-hardening-1768/#9

​Different gelatin will have different coloration. I think the yellowing is not because you haven't used enough gelatin, it's because you've used too much...

Anyway, Diana's suggestion is sound: if you can find papers that works w/o sizing opt for them, since sizing is an annoying task.

Regards,
Loris.


2013/12/15 Luciano Teghillo <luciano at lucianoteghillo.com>

> Hi Loris,
>
> Sorry, I meant 3%. I used 12g of gelatin in 400ml of distilled water.
>
> 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 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>
> wrote:
> >
> > 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.
>
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