I decided to do a quick sky study today. I usually use ultramarine blue for my skies but thought I'd find out what I get with pthalo blue instead. Phthalo is a cool blue and it gives great grey/black when mixed with burnt sienna. It follows it should be good for greys and stormy skies. But it's a bit too blackish grey... I think I'll go back to the warmer ultramarine blue because it' gives more realistic warm greys for a stormy sky. Enjoy! Retweet this
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