What can a dull form made by adding grey to a colour be called?

Correct answer: Tone

Correct answer: D, tone. In basic colour theory, adding grey to a colour produces a tone. The grey reduces the colour’s vividness and makes it appear softer, duller, or more muted. A is wrong because a tint is made by adding white and normally makes the colour lighter. B is wrong because a shade is made by adding black and makes the colour darker. C is wrong because value refers to the lightness or darkness of a colour, not specifically to the result of mixing grey into it. The key is to identify the added material: white gives a tint, black gives a shade, and grey gives a tone. A tone may also be light or dark, but the word tone here describes the grey mixture. Memory cue: grey makes tone; do not confuse tone with value.