A painter needs a bright green for a sunlit area and a muted green for shadow. Which plan is suitable?

Correct answer: Yellow-dominant green for sunlight and green muted with a little red or grey for shadow

The governing concept is colour mixing for value and intensity. Adding relatively more yellow to green gives a lively, warm, bright green that suits a sunlit area. For the shadow, a small amount of red, its complementary influence, or grey lowers saturation and creates a muted green without removing the green identity. Using the same pure green in both areas would not clearly show light and shade; black, white, or blue alone would not make the required green variations.