Re: Gum printing

two birdie shot here:
 
lump gum:
indeed, lump takes two days to dissolve...i tried grinding it up into dust in a spice grinder too, it still took two days (don't grind, you'll never be able to filter out the impurities)...Christina, I've seen your gums online and they're magnificant...what ratio do you use for your gum cc:gm? also, do you just spoon in your dichromate? would love to know
 
as for sizing, i don't have access to anything i can't make myself, so i need a good old-fashioned sizing process i can do with household ingredients...any thoughts? i've heard cornstarch, but that's not easy to find in cairo

"Christina Z. Anderson" <zphoto@bellsouth.net> wrote:
Maria,
Powder and lump are both fine, but powder you can use immediately. I whip
it up in the blender a couple quarts at a time. That said, I saw my prof
Sam Wang stir the gum powder right into his pigment/water/dichromate mix and
brush his coat on!

I have never used gum in lump form, but it is said it takes a day or two to
dissolve. I am not sure if this is true from firsthand experience. There
is a big can of the lumps in our grad studio, so I should see.

If you already have formalin, use that. I used to not size my paper, but
sizing produces very predictable results and prevents pigment stain. Try no
size, and if stain haunts you, then size.
Chris

----- Original Message -----
From: "maria ahlberg"
To:
Sent: Saturday, January 29, 2005 4:24 AM
Subject: Gum printing

>I wonder if there is any difference mixing gum arabicum from powder or from
>lump.
> How long does it take for the lump to become solution?
>
> I have a paper called BFK Rives 250gram and i have formalin, but i have
> not decided if i should size the papers with this or with glutaraldehyd.
> I have good experience with formalin, but i have never used glutaraldehyd?
> Is there someone who can help me with this questions?
> Maria Ahlberg ,Sweden Uppsala
>
>
>

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Received on Mon Jan 31 00:50:51 2005