What information is gained by applying a stroke on test paper before filling?

Correct answer: The actual value, flow and consistency of the colour

A test stroke is a practical checking step before applying paint to the final work. It reveals the colour’s actual value, opacity, wetness, flow, and consistency on a similar surface. The artist can then add water or pigment and adjust brush loading if necessary. Therefore option A is correct. The price of the brush, paper length, and painting title cannot be learned from the stroke.