Re: gum printing

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From: Catherine Rogers (crogers@mpx.com.au)
Date: 02/28/03-12:16:11 PM Z


Hi all,
My understanding is that gouache, or good gouache anyway, is made up of much more finely ground pigment - much finer ground than poster paint. This gives a richer, denser colour. Better quality pigments are used in gouaches too.

cheers
Catherine

  ----- Original Message -----
  From: FotoDave@aol.com
  To: alt-photo-process-l@skyway.usask.ca
  Sent: Tuesday, February 25, 2003 10:01 PM
  Subject: Re: gum printing

  Hi Judy,

  I believe long long time ago gouache and poster color were basically the same thing, which was pigment with filler or white added, except that gouache was a more expensive version, so it had higher pigment to filler ratio.

  Then W&N changed that. They specifically say in their literature that they achieve higher opacity in their gouache by using more pigment instead of by adding filler. Nowadays I think most so called artist gouache are without filler whereas cheaper grades (student grade or kids grade) still have white or filler added.

  Dave S

    I got into conversation
    with a Winsor Newton paint pro, who pointed out that gouache in the tube
    has much more pigment. That would account for its extra covering power...
    I'd also thought that it has other opaquing ingredients, which was a
    reason for not using it past the first coat. She said not... but then in
    another one of those coincidences (the prepared mind, I suppose), I again
    came across a reference to gouache in the Franklin Jordan book... and HE
    says it has white added.


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