Re: Colors for Gum
SCHRAMMR@WLSVAX.WVNET.EDU (a.strauss@worldnet.att.net)
Wed, 11 Dec 1996 20:56:32 -0500
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> From: Lawrence Shapiro <leshapiro@worldnet.att.net>
> To: Multiple recipients of list <alt-photo-process@cse.unsw.edu.au>
> Subject: Colors for Gum
> Date: Wednesday, December 11, 1996 2:52 PM
>
> To all Gummists,
> I have been doing some multiple color gum prints (not 3 color prints
> just images where one tone is one color and another tone is a second
> color). I have noted that some pigments deposit a much stronger layer
> than others despite the dilution in the gum (or gloy) and dichromate
> being held constant. For example phthalo blue and pyrol red deposit
> very intense layers while greens, burnt umbers and siennas cover much
> less. Rowney's Jet black gouache gives a dark black but I'm not sure
> if its the pigment or the fact that it is a gouache. Some catalogues
> of water color pigments note that a particular pigment is transparent,
> semitransparent or opaque but I've not found this to be a useful guide
> in trying to pick pigments. The best test I've found is actually
> mixing up the pigment with the binder and the dichromate and making
> an exposure.
>
> What favor pigments, brands or types of paint are out there?
>
> Larry Shapiro