How will wet-on-wet behave if watercolour paper is wetted unevenly?

Correct answer: Colour will spread at different rates and create irregular edges

Wet-on-wet painting depends on the moisture already present in the paper. Where the surface is wetter, pigment travels farther and more freely; where it is only damp or nearly dry, the movement slows and edges become sharper. Uneven wetting therefore produces uneven spreading, blooms, and irregular boundaries. Option D correctly describes this behaviour; the other options ignore the effect of different moisture levels.