explain the significance of using colors in "the scarlet letter"

Scarlet (red) has always been a symbol of "lust," or "passion." The symbolism of the Scarlet Letter, which is the most prominent color in the novel, is a symbol of Hester's sin more than anything else. The other colors - for example, the colors of the clothes the Puritans wear - symbolize their lives and how somewhat dreary those lives are.