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What effect does repeatedly adding water have on a poster-colour mixture?

Answer and explanation

Correct answer: Consistency and opacity may decrease

The governing concept is dilution. Poster colour normally covers well because its pigment is sufficiently concentrated. Repeatedly adding water lowers the pigment concentration, making the mixture runnier and potentially reducing its opacity and covering power. Therefore, option D is correct. Water does not make paint thicker, create a metallic sheen, or make it permanently waterproof. Add water gradually, mix thoroughly, and test the coverage before applying a large area.

Related tags

Poster ColourWater ControlOpacityPaint ConsistencyColour DilutionPainting TechniquesArt EducationClass 9 Mcq

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