duotones
/ˈduəˌtoʊnz/
noun
- Plural of duotone; multiple pictures or designs that use two colors or two shades of the same color.
- The gallery displayed several duotones from the 1920s advertising era.
- The book's illustrations were all duotones, using only sepia and cream.
- She experimented with duotones to give her photo series a unified look.