Artists in classical cultures such as Egypt, Mesopotamia, Greece and Rome were known to paint with a variety of hues — a practice known as polychromy (from Greek, meaning “many colors.”) So why do we always think of antiquities as colorless?Artists in classical cultures such as Egypt, Mesopotamia, Greece and Rome were known to paint with a variety of hues — a practice known as polychromy (from Greek, meaning “many colors.”) So why do we always think of antiquities as colorless?