What is formed by adding black to a colour?

Correct answer: Shade

Adding black to a colour makes a darker version called a shade, so option D is correct. For instance, black added to blue creates a darker blue shade. A tint is produced by adding white, and a tone is conventionally produced by adding grey or a neutral mixture. A complementary colour is selected from the opposite relationship on the colour wheel, so it is not created simply by adding black.