U of S | Mailing List Archive | alt-photo-process-l | RE: Gum Sizing Brush, Roller, Tray

RE: Gum Sizing Brush, Roller, Tray


How long does the formalin/gelatin solution last, ie when does it
start to harden?

And what surface (roughly) can you coat with 200 ml ?

Thanks & best,


> -----Original Message-----
> From: Henry Rattle [mailto:henry.rattle@ntlworld.com]
> Sent: maandag 7 april 2008 17:51
> To: alt-photo-process-l@usask.ca
> Subject: Re: Gum Sizing Brush, Roller, Tray
> Robert,
> Like you I used to immerse paper in gelatin solution (often twice) and
> then
> in dilute formalin. Nasty fumes, as you say, though not too bad with
> the
> windows open. However the whole process was tedious and messy, with
> of
> gelatine and having to wait for paper to dry twice or even three
> Then I tried brush sizing - ten times easier and just as effective. I
> up gelatine at 3.5%, take 200 ml of that in a jam jar, stand that on
> old
> hot tray (hostess tray?) to keep it at about 130-140 deg F (55-60C)
> add
> 6 ml of 30% formalin. Then coat generously on one side of the paper,
> it
> flat (face up, of course...) on newspaper until cool, and finally hang
> dry. I use a two inch decorators brush, and borrow the domestic
> rack
> and plastic pegs for drying.
> Compared to the immersion way, this is economical in gelatin, formalin
> time, and seems to produce just as good results.
> The fumes aren't bothersome (though I keep windows open and a fan
> outwards) and I shut the room and keep out for the rest of the day,
> to
> be sure.
> Best wishes
> Henry
> On 7/4/08 16:11, "Robert Newcomb" <newcombr@uga.edu> wrote:
> > Hello,
> > When it comes to putting size on paper for Gum prints, have you
> > brushing it on, using a small paint roller or dipping the whole
> > in a tray of size to be the preferred method?
> > When I first tied gum printing several years ago, I would immerse
> > entire sheet in a tray of warm gelatin and then carefully drag the
> > sheet over the edge of the tray to remove some of the excess, hang
> > and dry.  I believe this is the method in the "Gum Bichromate Book"
> > which was my only guide at the time.
> >
> > I also vividly remember having to endure the burning eyes while
> > large amounts of formalin - maybe thats why my hair is white?
> >
> > I saw Christina's post "I have not yet tried Kerik Kouklis' handy
> > method of adding 6 drops of formalin per 10ml hot gelatin at time of
> > brushing it onto paper which would probably be the ticket."
> >
> > So, have more experience people found brushing smaller amounts to be
> > a better way?
> >
> > After some time away from printing, now that I have my darkroom back
> > again, I'm ready to start again.
> >
> > thanks for the help!
> >
> > Robert Newcomb