From: Robert Newcomb (Robert.Newcomb@gactr.uga.edu)
Date: 02/04/03-07:26:33 AM Z
One thing to consider is the different overall look of Oil vs Gum. Oil or
Bromoil tend to have a "grittier" look due to the way the pigment is stippled
on. It can also be difficult to get the ink on in an even way on larger
prints. The more you work an oil/bromoil print the more closed up the
grain/stipple becomes and the use of a fine bear hair brush will also do
this. While gum is also made with pigment and can vary from a soft look to
one of high sharpness, it is a different look then oil and bromoil - perhaps
a more "photographic" look.
For what it's worth...
Robert N.
"Gordon J. Holtslander" wrote:
> Hi
>
> Persistence pay off - I'll try selective coloring with gum. I realized my
> kids have a variety of watercolor pigments at home. I have everything I
> need to try this.
>
> One of my co-worker has given me a cast-off container of gelatin. Does
> anyone know of an easy way of determining the bloom rating of this?
>
> Gord
>
> On Mon, 3 Feb 2003, Katharine Thayer wrote:
>
> > Gordon J. Holtslander wrote:
> > >
> > >
> > >
> > > I could do this with gum, but it would involve a _lot_ of masking.
> > >
> >
> >
> > This is true, if you wanted there to be nothing at all, not even a very
> > faint almost invisible image, in the areas where you didn't want color.
> > But at the risk of sounding like one of those evangelizing fanatics who
> > won't take no for an answer, I'll add that using Jack's method of
> > setting the image in gum using just gum and dichromate with no pigment,
> > the image in the noncolor areas would only be visible at certain angles
> > if probably cleared, since gum itself is clear and the dichromate should
> > be entirely cleared out of the hardened gum.
> >
> > Or you could do like Giacomelli did and just opaque out on the negative
> > the areas you don't want to print; in that case you'd need a separate
> > negative for each of the colors.
> >
> > Okay, I'll leave off evangelizing about gum; go in peace and print oil
> > if that's what you want to do, but just wanted to make sure you
> > understood what you were deciding against.
> >
> > By the way, most photographers' supply houses have gelatin at different
> > hardnesses.
> >
> > Katharine Thayer
> >
>
> ---------------------------------------------------------
> Gordon J. Holtslander Dept. of Biology
> holtsg@duke.usask.ca 112 Science Place
> http://duke.usask.ca/~holtsg University of Saskatchewan
> Tel (306) 966-4433 Saskatoon, Saskatchewan
> Fax (306) 966-4461 Canada S7N 5E2
> ---------------------------------------------------------
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