** Mini Challenge 563 - Living Colour **

Started 2 months ago | Discussions thread
aglake
aglake Regular Member • Posts: 435
aglake #1: Common Grackle in the sun
3

Most of the time, grackles somewhat plain: black body with blue around the neck but when the sun shines on them, they become much more colorful.  The colors come from interference in the reflected light.  Put on a polarizing filter and the colors disappear.  (I tried using a circular polarizing filter and the colors were gone.)

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