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If the boundary between two adjoining poster-colour areas looks darker after drying, what is a likely cause?

Answer and explanation

Correct answer: The two layers overlapped excessively at the boundary

The governing concept is control of paint load and layer thickness at adjoining edges. If both coloured areas overlap too much, the boundary receives a thicker deposit of pigment than either area alone. After drying, that heavier deposit can appear darker and create an unwanted stripe. Paper size, the length of a colour name, and palette colour do not explain this local darkening. Careful edge control and a moderate paint load prevent it.

Related tags

Dark BoundaryOverlapLayer ThicknessPoster ColourClean EdgesColour Filling And BlendingPainting TechniquesArt Education

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