The sentence should read: I soaked (not soacked) The colour! Pink only really means the colour. The sentence is saying that the warmth of the bath tub turned their skin pink! The sentence is also getting at how metaphorically they washed themselves clean, a sort of cleansing process!

By rancid I believe the writer means that his or her body was very smelly and dirty. By soaking the body pink in a steaming hot bath, just means that if you are in the hot bath your skin will become pink as your body tries to decrease its temperature by dilating small blood vessels near the surface of your skin. It just means staying in the hot tub for a while to cleanse oneself.

The use of the word "rancid" is used to describe food that has gone bad not someone's body.

Corrected: I soaked my rancid body pink in a steaming-hot tub." soaked < corrected 그는 (이나 그녀는) 욕조에 있었는 그의 피부까지 분홍색되었어요. 그러면, 아마 욕조는 아주 더웠어요. He (or she) was in the tub until his skin became pink. So, maybe the tub was very hot.

In hot water your body will turn red or pink! So her body turned the color pink in the hot water! :P