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Besides the blue of the oceans, the dominant color of our planet, as we know it, is green. But imagine a time when the Earth looked a little … purple.
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References:
https://www.livescience.com/1398-early-earth-purple-study-suggests.html
http://www.jstor.org/stable/27858961
http://www.amnh.org/explore/science-bulletins/earth/documentaries/the-rise-of-oxygen/article-earth-without-oxygen/
https://origins.asu.edu/blog/oxygenation-catastrophe
https://www.scientificamerican.com/article/archaebacteria-the-third/
https://www.asm.org/ccLibraryFiles/FILENAME/000000002127/znw00306000120.pdf
http://science.jrank.org/pages/5195/Photosynthesis-Halobacterium.html
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