Final answer:
Monochromatic color harmonies indeed use tints, tones, and shades of a single color to create a harmonious composition. This approach is true and is an effective way to ensure unity in a work of art.
Step-by-step explanation:
Monochromatic color harmonies use tints, tones, and shades of one color to create a color harmony. This statement is true. Monochromatic schemes demonstrate a high level of unity and visual coherence since all the components of the artwork derive from a single hue. Artists vary the intensity and value of a color by adding white to create tints, black to create shades, and grey to achieve different tones. This can be seen in artworks like Monet's Untitled (Houses of Parliament, London) from around 1900, which demonstrates the subtle variations of one color to produce a harmonious effect. Also, according to color theory, monochrome is a simple yet effective approach to arrange colors because they all relate to the same hue, hence there's a natural harmony within the artwork.