It's considered good luck to be married in a white garment. White heat is a state of intense enthusiasm, anger, devotion, or passion. To white wash is to gloss over defects or make something seem presentable that isn't. White water is the foamy, frothy water in rapids and waterfalls. The ancient Egyptians and Romans used black for mourning, as do most Europeans and Americans today.
Black humor is morbid or unhealthy and gloomy humor.
In China, black is for little boys. Black is associated with sophistication and elegance. A black belt in karate identifies an expert. A black flag in a car race is the signal for a driver to go to the pits. A black guard is a scoundrel.