An artist wants to control the boundary while blending wet colours. Which measure is most effective?

Correct answer: Use small controlled strokes while limiting surface and brush moisture

The governing concept is controlled wet blending. A lightly damp surface and brush permit gradual movement of colour, while small deliberate strokes keep the meeting boundary within the intended area. Excess water creates uncontrolled blooms and runs; rapid rubbing can disturb the paper or muddy the mixture; an overloaded brush releases too much paint and moisture. Thus option A offers the best balance between a soft edge and a controlled boundary.