When the British took over India, having a white complexion served as a signal of aristocracy for British. People with fairer skin color enjoyed more rights and opportunities than those with dark skin. Indians with lighter skin tones were often considered to be rich and wealthy. These light skinned Indians received preferences in education and in employment. Darker skinned individuals were socially and economically disadvantaged due to their appearance. This is still common in India as most Indian actors and actresses have light skin, and the beggars on the street are dark skinned (from being out in the sun all day).


The whole song is about people trying to change their appearance to become more mainstream, or in this case, white. The hindu sadhus are becoming shiva and are free from associations. They are not trying to fit in to mainstream, they are destroying it for the good of God.
I’m not hindu, I just love the ascetics.