I'm sorry for the Star Wars example!
but colors are also interchangeable in the Star Wars movies.
Such as X-wing fighters, and ships of the good shoot red lasers. While the TIE fighters, and dark ships shoot green, but the color of darkside lightsabers is red, and one of the colors of good lightsabers is green. This is an example of how it can be interchangable.
Ironic it is that with all the evil green about, Sauron seeks to destroy all good and green. I believe it just goes with the connotation behind it.
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"'Eldest, that's what I am... Tom remembers the first raindrop and the first acorn... He knew the dark under the stars when it was fearless - before the Dark Lord came from Outside.'"
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