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What may happen if a student uses the same dirty brush for every mixture?

Answer and explanation

Correct answer: Unwanted colours may enter and make mixtures muddy

The governing concept is avoiding contamination between mixtures. A dirty brush retains traces of the previous colour and transfers them into the next mixture. Those unwanted traces alter the hue and may make the new colour dull or muddy, so option C is correct. A dirty brush does not purify colours, guarantee that every colour becomes lighter, or make paint dry automatically. Cleaning or rinsing the brush prevents this problem.

Related tags

Dirty BrushMuddy ColoursColour ContaminationPainting ToolsColour MixingColour TheoryArt EducationClass 9 Mcq

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