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Title : Gouache Tests: Consistency, Smell, and 'Re-Wettability'
link : Gouache Tests: Consistency, Smell, and 'Re-Wettability'

Gouache Tests: Consistency, Smell, and 'Re-Wettability'

Illustrator Cathy Gura asked me some questions about the paint consistency of gouache, and I wasn't sure of the answers, so I asked her to do some tests and report back. Here's what she found:

"The test: first, I took six different brands of gouache and tested them right out of the tube. Then I placed fresh paint into full size pans and let them dry for five days, at which time I reactivated the gouache with water and painted.

The brands 

Schmincke Horadam Delft Blue 

Holbein Artists’ Pure Blue

Daler Rowney Powder Blue

Utrecht Designers

M. Graham Cerulean Blue

Winsor and Newton Designers Sky Blue

Materials

14 and 15 ml. tubes of gouache (Winsor and Newton)

a #6 brush so I could get a good load of paint 

Crescent HP Illustration Board: medium weight. 

Gum arabic (by Rublev Colors) 

and glycerin, vegetable source.

Glycerin and Gum Arabic Tests

I added three drops of gum arabic to a pan of Winsor and Newton gouache, and added three drops of glycerin to another pan of W and N gouache, and let them dry for five days, and reactivated them.

Results: Paint consistency

All of the gouache brands were thicker and creamier right out of the tube. With the exception of Winsor and Newton, I found it difficult to reactivate the paint: the gouache was noticeably thinner and felt like using watercolor. The W and N was thinner, too, but less resistant to rewetting.

Winsor and Newton: the original gouache cracked minimally in the pan; the pans with gum arabic and glycerin did not crack at all. The gum arabic made the gouache a little glossier; the addition of glycerin was the glossiest.

Results: Smell
Schmincke: an older tube smelled badly, the second tube was new, and had only a slight chemical smell
Holbein: no smell
Daler Rowney: slight smell
Utrecht: strong petroleum smell
M. Graham: slight chemical smell, did not smell of honey
Winsor and Newton: mild chemical smell: like school poster paint

Conclusions
• For best results, I would recommend working with gouache directly from the tube.
• If one wished to make a portable palette, one could set up pans of gouache: I would recommend W and N or Schmincke.
• Gum arabic made the gouache slightly glossier, and glycerin the glossiest, but both were thinner.
• I will continue to work with Winsor and Newton. For the price, I did not find Schmincke noticeably better than W and N, but I tested only one color.

• I would highly recommend avoiding Utrecht: the petroleum smell was awful.
• Holbein was thick and creamy.
• Winsor and Newton gouache dries with a slight sheen without any additives.


Here is my chart: I had to patch my scan together, and a photo of my paints."
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Thank you, Cathy. Check out Cathy Gura's website

Previous posts:

Questions about Gouache

Gouache: tubes or pans?

Gouache info from manufacturers

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