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Re: Paper for Oil Painting
Judy,
I raised a question about an uneven look of my oil tissue after sensitizing.
It looked spotty.
This was my question :
So again : I am trying to make my first oil print that looks like an
oilprint. I coated some sheets of Rifes Bfk with
three layers of gelatin, 5%, 7% and 7% and in the first layer some
potassiumalum.
After sensitizing (3 minutes 3%) and drying of the tissue the look is very
uneven. The orange stain has pattern of orange and less orange colored spots
( a little smaller than a finger tip). It looks like the dichromate is not
evenly hold by the paper (or gelatin). After exposure this
unevenness still visible until I have washed all the dichromate out of the
paper.
Is anyone familiar with this? Does this mean that my gelatin coats were to
thin or uneven ?
Regards,
Witho
----- Original Message -----
From: "Judy Seigel" <jseigel@panix.com>
To: <alt-photo-process-l@skyway.usask.ca>
Cc: <alt-photo-process-error@skyway.usask.ca>
Sent: Wednesday, May 01, 2002 7:52 AM
Subject: Re: Paper for Oil Painting
>
> I could swear someone asked about oil printing yesterday (I think the
> above subject line is a typo)... Cleaning up the file (trying to delete
> stuff, tho that's a sure jinx - the moment I do that I need it urgently) I
> came across this from March '99. It may answer the question...
>
> J.
>
> On Thu, 25 Mar 1999 arkins@banet.net wrote:
>
> > Dave:
> >
> > I have been doing oil printing, and using Pollmeier's formula, which is
> > excellent. I add the starch (I use potato, but corn will do as well)n
> > uncooked, by mixing it with a little water and adding it to the hot
gelatin at
> > the same time as I'm adding the alum/acetic acid solution. The hardener
> > really helps to avoid blistering and having the gelatin detach from the
paper
> > base. Remember that the inking process involves a lot of abrasion of
the
> > gelatin by the brush, so a little hardening makes the gelatin
sufficiently
> > tough to resist tearing when being pounded by a bromoil brush. The
starch is
> > essential because it adds "tooth" to the gelatine surface which allows
the ink
> > to adhere better. (In my opinion, it is an essential additive. . .)
> >
> > With regard to coating, soak the paper in hot water first and squeegee
on to
> > plexi and surface dry with a paper towel. Use a narrow-spouted pouring
> > implement (I use an olive oil dispenser) with a long spout, which will
allow
> > you to pour the hot gelatin really near the paper surface. (This avoids
air
> > bubbles, a real problem with coating gelatine emulsions.) "Tease" the
> > gelatine across the paper surface with a rubber hair comb, working
quickly
> > before the gelatine sets. After about 10 minutes, remove the coated
paper from
> > the plexi and hang up to dry, using clips on each corner to minimize
curling
> > as the coated paper dries.
> >
> > Another anti-bubble aid is to strain the gelatin through a woman's
nylon
> > stocking as you pour it from the container on to the paper. Also,
using
> > boiled (and subsequently cooled) water eliminates dissolved oxygen from
the
> > water used to prepare the gelatin emulsion, which is another desirable
> > techinique to employ.
> >
> > Oil printing is fabulous, if frustrating at times. When you do
your
> > pre-inking soak, try 1/2 hour at 68 deg. Fahrenheit. Temperatures much
higher
> > than 75 deg. F. are conducive to blistering.
> >
> > keep me advised on your progress!
> >
> >
> >
> > Regards
> > Joe Arkins
> > NY, NY
> >
> > FotoDave@aol.com wrote:
> >
> > > Hi, I am searching through my old files and found this formula (from
Klaus
> > > Pollmeier) for oil printing:
> > >
> > > - Prepare 140 ml of a 15% gelatin (Bloom Index >200) solution
> > > - add 14 ml of a 15% potato starch (dextrine) solution
> > > - while stirring, slowly add 14 ml of a hardener, made by mixing
6 ml
> > > of a 6% sol. of acetic acid and 8 ml of a 1% sol. of chrome
alum.
> > >
> > > I would like to try oil printing but have some questions:
> > >
> > > Will food gelatin work? How much should I use?
> > >
> > > Can corn starch be substituted in the above formula? Also, I assume it
is
> > > uncooked starch (rather than cooking into paste). Is this true?
> > >
> > > Why does the gelatin need to be hardened? How can hardened gelatin
work?
> > >
> > > Thanks in advance for any suggestion / comment.
> > >
> > > Dave S
> >
> >
> >
>
>