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Title : Casein Emulsion and Varnish
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Casein Emulsion and Varnish

Julien from France asks:
"I've finally bought Richeson casein online, still quite expensive [to import to Europe], but quite cool, actually different from gouache or Holbein's Acryla Gouache. My question is, have you used the Shiva casein emulsion or varnish, and can you use it with gouache?

First, a little background. For those who don't know, when you buy the emulsion separate from the paint, you're getting the liquid glue-like binder that holds the pigment together. Casein emulsion is a water-soluble, milk-based protein in liquid form in a can or jar. It's the same stuff that they use to formulate the paint.

Shiva is the company that originally made casein paint. The company was bought by the Jack Richeson company, which markets the product under both the Shiva name and Richeson brand, but I believe they're the same product.

Detail of Skysweepers, painted with gouache with some acrylic medium

In answer to your question, I have only experimented a little with the casein emulsion. I don't see any reason why you can't use casein emulsion with gouache. It would make gouache behave more like casein. You could even use acrylic medium with gouache. I used to do that a lot, because I liked the opacity of gouache, but I wanted it to have the sealed surface of acrylic.

I have used the casein varnish made by Richeson, which is a liquid brush-on varnish. As far as I know, they no longer make it. I found that it doesn't work well with watercolor paper because the paper is so absorbent. It just soaks the varnish up, so it requires a lot of coats before you start getting a gloss.

But on a panel, the varnish develops gloss with just one or two coats. The varnish is helpful for bringing out the depth and richness of dark paintings. If you're using paint with a matte surface, dark passages are prone to looking chalky. I find that the matte surface of gouache or casein is better suited to more high-key palettes.

Since I don't think you can get the liquid brush-on casein varnish anymore, you could use a spray varnish, but be ready to use a few coats, depending on the absorbency of the ground, and keep in mind that once you apply a varnish, you can't paint over it with either casein or gouache.

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Previously:
Your Casein Questions
Questions about Casein and Gouache

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