Cobalt Blue and Ultramarine Blue (this needs to be expanded) The theory behind the Zorn palette is that ivory black is used instead of blue to darken values, but Anders Zorn did not always use the limited palette he is famous for and was known to have also used Cobalt Blue. Ultramarine Blue is particularly versatile in mixes, and it is an excellent choice of blue if you are painting with a limited palette.

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