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Why are the same lighting and paper necessary when comparing tertiary colours?

Answer and explanation

Correct answer: To reduce differences caused by external conditions

The governing concept is controlled observation. Light colour, direction, and intensity can alter how hue, value, and saturation appear, while different papers can absorb paint or reflect light differently. If lighting or paper changes between samples, the observed difference may come from the conditions rather than the tertiary colours themselves. Therefore option D is correct. Standardising both variables makes the comparison fair and repeatable; it does not dry paint, reduce brushes, or change the colour wheel.

Related tags

Tertiary ColoursColour ComparisonLightingPaperColour TheoryArt EducationClass 9 Mcq

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