grisaille
/ɡrɪˈzeɪl/
noun
- A painting or decorative technique done entirely in shades of gray, often used to create a sculptural or monochrome effect.
- The museum displayed a beautiful grisaille study that the painter made before adding color to the final work.
- The artist used grisaille to paint the stone columns so they looked three-dimensional.
- Many stained-glass windows include grisaille panels to add shading without color.