Background from Spirited Away (Sen to Chihiro no Kamikakushi, 千と千尋の神隠し, 2001 Studio Ghibli)pic.twitter.com/vvuZZKbDJu
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I'm not the autor, anyway it's traditional backgrounds maybe with a little part of postproduction.
Thanks Tohad, yep, was wondering indeed if there were special pigments or techniques to produce this kind of light without post : ) love your feed and work by the way 
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