Re: Purchase of gum arabic

[John Cremati <johnjohnc@core.com>]

Has anyone ever tried to run  Gum Arabic thru  activated carbon  and then a
fine   vacuum  assisted filter ? .......John Cremati
----- Original Message -----
From: "Hans Nohlberg" <chiahans@tripnet.se>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Thursday, May 16, 2002 8:02 AM
Subject: Re: Purchase of gum arabic


> Judy
>
> Yes, we made some tests some years ago. The gum solution was dark as
> strong coffee, like espresso ristretto. This gum we bought readymade
> in solution from a graphic shop. We then notized a difference when
> printing 5-7 layers (four colour gums from separation negs) and did
> no further printing using this gum. Now we have thrown it away. We
> use the lumps because it's a feeling working from scratch....
>
> Hans & Chia
>
>
>
> >On Tue, 14 May 2002, Hans Nohlberg wrote:
> >>  ... Some gums gave a very dark
> >>  solution (even if the lumps were clear).
> >
> >Hi Hans... Did you ever test the dark vs. the light gum arabic with
> >pigment or paint?  I haven't found any correlation between darkness of
the
> >gum arabic and the quality of its printing, or even the color.
> >
> >My darkest gum (Daniel Smith lithographers') and my lightest gum (Winsor
> >Newton -- at something like 78 times the price) seem to print about the
> >same tone even of the lightest yellow.
> >
> >It may be different however when you're starting with the dry gum -- as
we
> >know, even the container is a variable in gum printing.
> >
> >Judy
> >
>
> --
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>
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>
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