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Old 05-01-2009, 03:03 PM
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Shirl Parker Shirl Parker is offline
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Gouache vs. "Poster Colour"

A friend lent me her gouache, but most of it is W&N "Poster Colour". Is it really gouache, is it student quality, what is it really? Anyone know? The only thing I could find on the W&N site was "Poster Colour Health & Safety Data Sheets", and only talked about toxicity and other safety stuff.
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Old 05-01-2009, 03:13 PM
halthepainter halthepainter is offline
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Re: Gouache vs. "Poster Colour"

I do believe that poster colors are made for the student market (child safe) and that the colors are not artist grade and not archival.
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Old 05-12-2009, 01:23 AM
sansnom sansnom is offline
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Re: Gouache vs. "Poster Colour"

Actually, a good proportion of the gouache sold is not ASTM I or II. (lightfast)

The recent history of gouache has been that it has commonly been used by designers and graphic artists who do not need permanence in their work, since it will be used for reproduction, and not hung as a finished work. This was not always so, and of course many great works have been made using gouache or so-called body colour.

Some manufacturers put the pigment used on the tube. Even fewer tell you which of their gouache paints are lightfast in their literature.
The most commonly questionable pigments used in gouache tend to be amongst the cool reds and violets. M Graham publish details of their artists' gouache here:

http://www.mgraham.com/html/technical.asp

(Just look for the 'G' in the listing for the paints that they supply as gouache).
Art Spectrum publish their gouache pigment information here:

http://www.artspectrum.com.au/pigmen...s_gouache.html

It is generally thought that BWS scale results of 6 or above are more-or-less equivalent to ASTM II or better.

Both Art Spectrum and M Graham appear mostly to rely on pigment concentration to achieve opacity, rather than using a lot of fillers or opaque additions like chalk.

There may be other manufacturers who do the same.

Since gouache is very similar to watercolour, you can for example substitute a reliable cool red from an artists' watercolour range, and so on. The essential difference will usually be in transparency, but colours can of course be made more opaque by adding white, powdered chalk or a similar opaque pigment.

Last edited by sansnom : 05-12-2009 at 02:05 AM. Reason: Add designer/graphic artist aspect
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Old 05-28-2009, 10:59 AM
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llawrence llawrence is offline
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Re: Gouache vs. "Poster Colour"

Quote:
Originally Posted by sansnom
Some manufacturers put the pigment used on the tube. Even fewer tell you which of their gouache paints are lightfast in their literature.
The most commonly questionable pigments used in gouache tend to be amongst the cool reds and violets. M Graham publish details of their artists' gouache here:
+1 to that - Da Vinci also has a line of gouache for which they include pigment information on the tube. W&N do not. If the manufacturer doesn't let you know which pigments they're using, you can't count on that color as archival, especially in the magentas.
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Old 05-29-2009, 09:30 AM
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dbclemons dbclemons is offline
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Re: Gouache vs. "Poster Colour"

Winsor & Newton show the pigment info and permanence ratings for their gouache product on their website. Granted it would be nice if it were on the labels also, but there you go.

If you're uncertain, it's not difficult to make your own simple lightfast test by placing samples under direct sunlight for a few months. Fugitive pigments will fade under such conditions in a relatively short period of time.

Cheaper paints are often made more opaque and thickened by additions of white pigment or fillers like barium sulfate.
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Old 05-29-2009, 01:18 PM
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llawrence llawrence is offline
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Re: Gouache vs. "Poster Colour"

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Originally Posted by dbclemons
Winsor & Newton show the pigment info and permanence ratings for their gouache product on their website.
Thank you.
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Old 09-16-2009, 09:43 PM
JPQ JPQ is offline
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Re: Gouache vs. "Poster Colour"

Royal talens tells. but saddly only few pigments actually used and i think blue what i get its somehow boring hue. also Schincke lists pigments actually if buy guache again i mainly going use Schincke i think.
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