Why is it important to keep the palette clean before mixing colours?

Correct answer: To prevent old colours from muddying the mixture

The governing concept is colour purity during mixing. Residue from an earlier colour can enter a new mixture and alter its hue, value, or clarity, producing a dull or muddy result. Thus, option B is correct: a clean palette helps the artist obtain the intended colour more accurately. A clean palette does not make the palette heavier, dry paint faster, or polish the paper. Cleaning the mixing area is especially important when preparing light or bright colours.