– What happens when an artist mixes paint for a painting? Are the pigments actually changing physically/chemically? What is actually happening to make the paints change color?
There are some excellent examples here of how paint particles look under a microscope which may make sense when you see them. The National Gallery has produced this one about works by [Monet](https://www.nationalgallery.org.uk/media/15524/roy2007.pdf)
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