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What is the best way to keep the boundary between two poster colours clean?

Answer and explanation

Correct answer: Let the first colour dry before applying the second

The governing concept is layering: a dry first layer forms a stable boundary, so the next colour does not dissolve or flow into it. Option D is correct because allowing the first colour to dry preserves a sharp edge. Mixing wet colours or adding excess water encourages bleeding, while tilting the paper does not reliably control the boundary and may cause unwanted flow.

Related tags

Clean EdgesDrying TimePoster ColourColour BoundaryLayeringPainting TechniquesArt EducationClass 9 Mcq

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