Canon EOS 80D - Manual (Page 143)

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3 Setting the White BalanceN
Cautions for Setting [Qw] (White priority)
 The warm color cast of subjects may fade.
 When multiple light sources are included on the screen, the warm color
cast of the picture may not be lessened.
 When using flash, the color tone will be the same as [Q] (Ambience
priority).