The vast majority of her work is created in black and white or sepia tones. Her photographs strip her subjects back to their barest essence, often capturing a moment of raw honesty. The black and white image is fairly unique to photography, a medium which offers to capture the world exactly as it is for a fleeting moment of time. By creating the images in black and white, Arbus at once captures a fleeting moment of reality and also reminds us that she is the author of that image, stripping it of its colour and dictating the way we look at that moment.
Original source: Diane Arbus and the Use of Black and White