When one attempts to clinically shade match a restoration to the existing dentition, which of the following is MOST correct?

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When one attempts to clinically shade match a restoration to the existing dentition, which of the following is MOST correct?
A . Take photographs outside in direct sunlight
B . Select value in overcast daylight or shade
C . Light source is non-contributory
D . Use a blue patient drape for color correction

Answer: B