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Small bubbles in a poster colour layer leave pits after drying. What is a likely cause?

Answer and explanation

Correct answer: Stirring the paint too vigorously

The governing concept is trapped air in a paint film. Vigorous stirring can incorporate many small air pockets into poster colour. As the layer dries, those bubbles rise, burst, or collapse and leave tiny pits, making option A the likely cause. Slow mixing reduces air entrainment, while a thin even application and dust-free preparation generally improve the surface. They do not normally create bubbles inside the paint. Mix gently and let the paint settle before application.

Related tags

Poster ColourAir BubblesPaint MixingPainting TechniquesArt EducationClass 9 Mcq

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