Opaque watercolors 'floated' on top of transparent layers can make such a dreamy 'veiled' surface. But you don't want to 'scrub' it on or you'll lift that bottom layer and make 'mud'. Here's the visual on how to make that cerulean blue (in this case) float on top of the Indigo with a fun exercise in making a night time sky - and little fireflies added in for fun!
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