Kaalratri the most ferocious form of Goddess Durga, Kalaratri is revered on Saptami. It is believed thatParvati removed her fair skin to kill the demons Sumbha and Nisumboa. The color of the day is Green. On Saptami, the Goddess appears in a white color attire with a lot of rage in her-fiery eyes, her skin turns black. The white color-portrays prayer and peace and ensures the devotees that the Goddess will protect them from harm.