What is the main effect of adding white to secondary colours?

Correct answer: They become lighter

Adding white increases the lightness, or value, of a secondary colour and produces a tint. For example, white added to orange creates light orange, and white added to green creates light green. The colour remains in its original family and does not become a primary colour. Black generally produces a darker shade instead, so options B and D describe the opposite effect. Hence secondary colours become lighter when white is added.