01 Where should acrylic colour be tested before applying it to the main painting?
Answer and explanation
Correct answer: D. On separate paper
Explanation: The governing concept is safe testing and practice before applying paint to the final surface. A small sample on separate paper allows the artist to check the colour, opacity, consistency, and brush mark without risking the main composition. Therefore option D is correct. Clothes, a wall, and a brush box are unsuitable surfaces because they may be stained or damaged and do not represent the final work reliably.