How should a dark colour be added to a light colour while mixing?

Correct answer: In small amounts

The governing concept is controlled colour mixing. Dark pigments usually have a stronger visual effect than light pigments, so adding a large quantity at once can make the mixture too dark and difficult to correct. Add the dark colour in small amounts, mix thoroughly after each addition, and observe the result before adding more. This gives better control of the final shade; the other methods do not produce a reliable mixture.