Final answer:
When doing a tint-back from a lighter color, black should be used to darken the color. Black is used for shades while white is used for tints in color theory, which is relevant to artists altering the value of a color.
Step-by-step explanation:
When doing a "tint-back" from a lighter color, you should use black, since black is used to darken a color. In painting and color theory, a tint is achieved by adding white to a color, making it lighter, while a shade is created by adding black, making it darker.
To transition from a light color to a darker one, you must mix in the appropriate amount of black to achieve the desired intensity and value of the color. The process of changing the value of a color by adding black aligns with the principle that value refers to the lightness or darkness of a color, impacting its overall shade.
This principle is essential for artists and designers who need to create gradations of a single color for shading or highlighting in their work. When doing a tint-back, the careful addition of black will result in a darker shade of the original color.