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What may be the main reason a fine white line turns grey over a dark poster colour?

Answer and explanation

Correct answer: The brush or white paint was contaminated by the dark colour

The governing concept is colour contamination: a small amount of dark pigment left in the brush or mixed into the white paint reduces the white paint’s value and makes it appear grey. Therefore, option C is correct. Opacity, paper thickness, or the straightness of the line does not normally create this specific colour change. A clean, well-rinsed brush and separate white mixture help preserve a bright fine line.

Related tags

White LineColour ContaminationClean BrushPoster ColourFine DetailPainting TechniquesArt EducationClass 9 Mcq

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