The use of one colour in a painting is known as?

Monochrome means using one color in artwork. Artists create monochrome paintings using different shades and tints of a single color to show light and shadow.

The word mono means one, and chrome refers to color. Monochrome art can be blue, red, brown, or any single color in various tones.

Monochrome is the correct artistic term for single-color work. The other options are not recognized art terminology for this technique.