If a mixed poster colour cannot be recreated accurately which record would be most useful?

Correct answer: Recorded ratio of colours and water with a dry sample

The governing concept is reproducibility in paint mixing. Recording the amount or ratio of each colour and the water used gives a practical recipe, while a dry sample shows the final appearance after drying. Thus option B is most useful. A colour name is too vague, and brush size or paper name alone cannot reconstruct the mixture’s hue, strength, and value.