While looking at cockpit photos I noticed the reflections of some guages(including crt's) have various colours, mostly green, orange, purple and blue. This suggests to me that glass on these is coated with anti-reflective coatings just like camera lenses to minimze reflections in direct sunlight and offer a clearer view. Could someone could confirm if im onto something here?
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Photo © Siegfried Huss
Note the purple reflection on co-pilots CRT's.