Mahakala is typically black in color. Just as all colors are absorbed and dissolved into black, all names and forms are said to melt into those of Mahakala, symbolizing his all-embracing, comprehensive nature. Black can also represent the total absence of color and signifies the nature of Mahakala as ultimate or absolute reality and transcendence of all form.
The most notable variation in Mahakala’s manifestations and depictions is in the number of arms, but other details can vary as well. For instance, the two-armed Mahakala was transformend from the first Buddha, Ardhalma and is worshiped for his spiritual wisdom. The four-armed Mahakala was transformed from the Sambhogakaya Buddha. The six-armed Mahkala comes in two forms : one white and one black. His white form helps one attain riches and a longlife. His black form was transformed from Avalokitesvara and helps people conquer any obstacles on their path to enlightenment.