Final answer:
Achromatic color harmonies consist of whites, grays, and blacks, which is true. These colors do not exhibit hue and are used to create balance, neutrality, and a sense of unity in design and art.
Step-by-step explanation:
Achromatic color harmonies consist of whites, grays, and blacks. This statement is true. Achromatic means without color, and in the context of color theory, it refers to hues that do not have chromatic content. Whites, grays, and blacks are considered achromatic because they do not exhibit hue; they are not found on the color wheel and do not have a dominant wavelength of light. White objects reflect all visible wavelengths of light evenly, black objects absorb all colors of light, and grey is the scale of values between white and black. These colors are often used to create a sense of balance, neutrality, or to provide a background against which other colors can stand out in design and art, as they do not compete for attention with chromatic colors.For example, in Claude Monet's painting Untitled (Houses of Parliament, London) from circa 1900, a high level of unity is achieved through a monochromatic color scheme. Monochromatic schemes use one hue in various tints and shades, which is not to be confused with achromatic, which uses no hues at all. However, the concept of unity is a principle that both monochromatic and achromatic color harmonies share.In conclusion, achromatic color harmonies indeed mainly include whites, grays, and blacks. This fact is fundamental in understanding color theory and the visual impact of these non-colors in art and design.