Bailang Beach in Fangchenggang is one of the rare "black gold beaches" in the world because it is rich in titanium in the sand and black in the white. Titanium sand bath is the simplest and most direct natural whitening method. Dig a pit on the beach, let the titanium sand bury itself, and the acidic substances such as sweat secreted by the human body can catalyze the reaction of titanium with oxygen. After being buried in the white sand beach in the sand, the human skin will feel a clear sense of smoothness.