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White poster colour has weak covering power even though its consistency is correct. What is another possible reason?

Answer and explanation

Correct answer: Residue of a previous dark colour in the brush

The governing technical concept is colour contamination. Even when the paint has suitable consistency, dark pigment left in the brush can mix into white, lowering its brightness and apparent covering strength. Option A is therefore correct. Flat paper does not normally weaken coverage, a clean palette prevents contamination, and a dry lower layer generally provides a stable surface rather than causing this specific problem.

Related tags

White PaintBrush ContaminationPoster ColourPainting TechniquesArt EducationClass 9 Mcq

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