On which bases should a tertiary-colour mixture be finally evaluated?

Correct answer: Correct components, suitable ratio, colour purity, and dry result

The governing concept is practical colour evaluation. A mixture should be checked for the intended component colours, their proportion, the resulting purity or saturation, and its appearance after drying. A wet paint layer may look glossier or darker than the dry sample, so wet brightness alone is unreliable. Option A is correct because it combines all relevant criteria; the other choices examine only one irrelevant or incomplete feature.