plasmon

Livescience_2013 03087.txt

Roughly speaking plasmons are ripples of electrons on an electrically conducting surface. Light shines on a metal and its plasmons can reradiate specific colors.

Some of the colors in stained-glass windows at cathedrals like Notre dame are produced by the plasmons in tiny particles of gold reflecting light

and producing an extremely vivid color. That is not how most color is produced now. When you look at a picture of a red flower on paper there is a pigment chemical that absorbs each color--green and blue for instance

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