Paint Films
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Paint Film Characteristics(Excerpts from ART HARDWARE: The Definitive Guide to Artists’ Materials, by Steven Saitzyk © 1987 revised 1998) If you use a typical painting medium that includes linseed oil with your paints, you have little cause to worry about the whether or not a particular pigment will embrittle your paint film. Just avoid using zinc‑based paints, such as zinc white, which is the most brittle of all the pigments, in underpainting. If you tend to sketch out your painting or do an elaborate underpainting with little medium, then you need to be aware that cobalt‑based colors, barium yellow, strontium yellow, and red oxides, although not as brittle as zinc paints, are not recommended for use in underpainting because they may cause the overpainting to crack. Not only do some pigments form hard and brittle paint films, but others form tough and flexible layers. Lead‑based paints, raw umber, and burnt umber are among the most flexible paints and are perfect not only for underpainting, but also for mixing with more brittle paints to stabilize them. (Excerpts from ART HARDWARE: The Definitive Guide to Artists’ Materials, by Steven Saitzyk © 1987 revised 1998)
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