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Last One! | by erwannf
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Last One!

Graphite holder of a plasma-enhanced chemical vapor depostion (PECVD) system, after a large number of depositions. Depending on the number and on the optical properties of the layers deposited on this surface, there are interferences leading to different colors. See for instance en.wikipedia.org/wiki/Thin-film_interference

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Taken on February 13, 2014