Grisaille

Christ and the Woman Taken in Adultery, Pieter Bruegel the Elder, 1565, 24 cm × 34 cm (9.4 in × 13.4 in)
Battesimo della gente, one of Andrea del Sarto's gray and brown grisaille frescoes in the Chiostro dello Scalzo, Florence (1511-26)

Grisaille (/ɡrɪˈzaɪ/ or /ɡrɪˈzeɪl/; French: grisaille, lit. 'greyed' French pronunciation: [ɡʁizaj], from gris 'grey') means in general any European painting that is painted in grey. [1]

  1. ^ Osborne, Harold, ed. (1970). The Oxford Companion to Art. Clarendon Press.