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Unicode 6.0 added several characters with descriptions that suggest those characters are supposed to be rendered in a specific color:
RED APPLE U+1F34E
GREEN APPLE U+1F34F
BLUE HEART U+1F499
GREEN HEART U+1F49A
YELLOW HEART U+1F49B
PURPLE HEART U+1F49C
GREEN BOOK U+1F4D7
BLUE BOOK U+1F4D8
ORANG...