Why do many masters take black and white photos?

Black and white photography tests lighting and equipment use skills. Black-and-white photos are characterized by highlighting the levels of objects. In addition to lighting, color filters are also used to adjust light of a specific color. There will be color deviation or excessive local color in color photos, but black and white photos will make the level of objects more obvious. For example, if you take a portrait with an orange mirror or a red mirror, your skin will be brighter and whiter in a black-and-white photo. Shooting flowers can distinguish dark flowers from green leaves, and only black and white photos turned out by color photos are dead black. In a word, black-and-white photos can distinguish a photographer's technical level from his understanding of using light.