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Title : Your Questions About Gouache
link : Your Questions About Gouache

Your Questions About Gouache

You had some questions on YouTube and Instagram:

Preston asks: Hey James, I want to start painting gouache en plein air. However, I’ve been having some trouble with the colors. I have experience oil painting, but all these gouache colors confuses me. There’s like 3 different types of reds such as “Spectrum Red, Primary Red, and Designer Red”, yet they all look like the same hue. Perhaps they have varying opacities? I plan on just buying Red, Blue, and Yellow with White and Black, and a few Earth Tones. I also plan on building the painting setup you discussed on your blog.

Gurney answers:  I would suggest buying gouache with well-known pigments, such as cadmium red, and avoiding colors with descriptive names like "spectrum red." As you probably know from your oil paints, the pigments are identified by Color Index Names (so cadmium red is PR108), and the reputable brands list pigments on the tubes. There's a website that tells you the pigment numbers. The opacity varies according to the pigment, and in my opinion, it's good to have some gouache pigments that are less opaque to use like watercolor in the lay-in stages.

Gouache is often marketed with "primary colors" or "spectrum colors" because it's so often used in art classes for painting color wheels. I would also beware of the cheap gouache sets that have weak pigment loads or pigments that aren't lightfast.

Brady asks: "I was wondering how you frame a gouache painting once you have completed it. For example, a painting that you finish for a client or plan to put in an art show."

Gurney answers: I would mat and frame your gouache behind glass. You have to protect that delicate surface, because a splash of water, a sneeze, or an oily touch would spoil it. You could use a thin wood or metal photo frame and a generous mat to make the frame look museum-quality. It is possible to varnish gouache and treat it like an oil, but not really recommended, because the beauty of gouache is that matte surface, and a varnish will bring out lots of surprising layers. As always, experiment first!

Jonathan asks: What did you use to tone the paper tan?

Gurney answers: I toned the paper with a thin layer of casein paint (white, yellow ochre, and light red), but you could use Acryla Gouache or tinted gesso, or even brown India ink.

Tom asks: When working with gouache, or casein for that matter, do you wait a little while before folding up the sketchbook to avoid smudging, or does the paint dry sufficiently to allow you to pack up almost immediately? 

Gurney answers: It dries almost immediately (unless it's raining and 100% humidity), so I can pack i it up immediately.

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