If a prepared green poster colour appears bluer than expected after drying, what should be done?

Correct answer: Add a small amount of yellow and test a new dry sample

A green mixture that looks too blue has a cool or blue bias. Adding a small amount of yellow shifts the mixture toward a more balanced green, but the correction should be tested in a separate sample because drying can change the apparent value and colour. Option B is correct. Black darkens, white lightens, and red can muddy the mixture rather than correcting the blue bias.