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Why is adding oil to poster colour inappropriate for obtaining a varnish-like shine?

Answer and explanation

Correct answer: Poster colour is water-based and oil may disrupt mixing and adhesion

The governing medium principle is compatibility. Poster colour is generally water-based, so adding oil can interfere with uniform mixing, drying behaviour, and adhesion to the surface rather than creating a reliable varnish finish. Option A is correct. Oil does not act like water, does not necessarily make the paint more opaque, and does not dry it immediately. A suitable separate protective medium should be chosen instead.

Related tags

Water Based PaintOil IncompatibilityPoster ColourPainting TechniquesArt EducationClass 9 Mcq

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