The best way I've found of understanding this is to think not so much of something "being" a color but of it "doing" a color. The rest is reflected out, and our brains read it as "color.". It shoots them to another energy level and that relevant bit of light, that glass-shattering "note," is used up and absorbed. Something similar happens with the electrons, if a portion of the light happens to catch their natural vibration. Imagine a soprano singing a high C and shattering a wineglass, because she catches its natural vibration. “When light shines on a leaf, or a daub of paint, or a lump of butter, it actually causes it to rearrange its electrons, in a process called "transition." There the electrons are, floating quietly in clouds within their atoms, and suddenly a ray of light shines on them.
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