What term associated with color defines lightness or darkness?

Poussin was responsible for establishing what as a key component of 17th century french art

All but one of the following are pairs of qualities related to the social-emotional environment of an early childhood setting. which is not related to the social-emotional environment of an early childhood setting? a. equity and authenticity b. protection and warmth c. nurturance and continuity d. respect and acceptance

The "neo-impressionists." as they were called at the time, believed that is the proper subject for their painting