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ghaff
on Nov 21, 2015
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Non-photo blue
It apparently has to do with infrared reflectivity and even has a name: Ageratum effect.
http://photobotanic.com/color-shift-ageratum-affect/
athenot
on Nov 22, 2015
[–]
Interesting! I thought it had to do with UV reflectivity. Thanks for the link.
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http://photobotanic.com/color-shift-ageratum-affect/