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What should be checked first if a green mixture appears browner than expected?

Answer and explanation

Correct answer: Unwanted red contamination

The governing concept is contamination in pigment mixing. Green normally results from combining yellow and blue, but unwanted red on the brush or palette adds a complementary pigment. That extra red can lower the brightness of green and shift it toward a muddy brown. Yellow and blue are the intended components, while paper size and the outer border do not change the mixture. Therefore, option A is correct.

Related tags

Muddy GreenRed ContaminationPigment MixingSecondary ColoursColour MixingColour TheoryArt EducationClass 9 Mcq

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