An artist applies a second colour over wet paint but also wants to retain a clear boundary. What should be done?

Correct answer: Wait until the first layer loses its shine and use a controlled, less-damp brush

The governing concept is moisture-stage control in layered painting. If the first layer is still glossy and very wet, the second colour will spread and mix; waiting until the shine decreases and using a less-damp brush limits that movement while preserving a clearer boundary. Option C is correct. Extra water, rubbing, or soaking the paper would increase bleeding and destroy edge control.