Discussion on Alum
- I marbled with oil paint from 1976 to 1984 (not being aware of the acrylic option, having learned marbling from someone who only marbled in oils). The reason you don't need to alum the paper when using oils is that the oil paint literally soaks into the paper (and generally through to the back of the paper as well). After 1984 I've marbled only with acrylics and yes, you do need to alum your papers (I marble on carrageen) if you rinse them after marbling. There is a chemical reaction between the alum and the pigments in the paints which bonds the color to the paper. The color is only on the surface, it does not permeate the paper like oil paints.
From: Susa Glenn [mailto:sglenn@...]
Sent: Tuesday, December 09, 2003 6:30 AM
Subject: [Marbling] Re: Contaminated size
If you don't want your acrylic paint to wash down the drain you do.
Need alum , that is. Methyl cel holds the pigment up on the surface
of itself. It's a physical/structual thing. It's not a chemical
thing. I don't know about oil paint; maybe it bonds to whatever well
enough alone. I just work with acrylics and if there is something
going wrong with the alum process, the final print shows it.
--- In Marbling@yahoogroups.com, "Maria Vernersson"
> Forgive me for repeating myself:oil
> You don't NEED alum when you workwith methyl cell (and acrylic or
> paint).importance of
> Marbling@yahoogroups.com skriver:
> >Hi, All,
> >I know that when I studied with Milena, she emphasized the
> >thorough skimming after printing. We worked mostly with paperand some
> >scarves onNoble on
> >At Houston's quilt conference, I watched a demonstation by Elin
> >marbling on fabric. She was working with methylcel. I wasintrigued
> >that afterfabric
> >pulling the print, she sort of "squished" the excess size off the
> >andcontaminate the
> >back into the tray! Seems to me that that would really
> >size,wonder if
> >yet I respect her experience and expertize. I can't help but
> >methylcel is more resistant to contamination with alum....PerhapsI am
> >phrasing thatresponse
> >question poorly. Guess I am asking how the two sizes differ in
> >towith both
> >alum. And guess I have some experimenting ahead of me as well
> >Happy holidays to all!
> >Caryl Hancock, Indianapolis
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