Could there be a material that inverts the colours seen through it?
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I had a vision of a creature that touched things, and wherever it touched, it left a mark opposite to the original colour.
For example when it walked across the grass the grass had red footprints, when it touched the wet stone it shone with a patch of white.
Could such a material, a liquid or perhaps a dust, that achieves the described effect exist?
If yes, how might it work or what would it be made of?
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