My goto main color for blue sky is usually Cerulean. But for the painting I am working on I need a dirty sky look. So I put the dark blues to test - Indanthrene which I love to use for when the painting calls for black AND Prussian which makes such a lovely dark water in my koi paintings (among other things). My bet was on Prussian, to tell the truth, but indanthrene won the test. See for yourself! The cerulean mix is the other two piles for comparison (at the end of the video) Holbein Artist Ma

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