Black is the color that's perceived where there is an absence of light. As a property of materials, this means that all wavelengths of light are absorbed. The opposite of black is white, as white is what humans perceive when confronted with all wavelengths of light at the same time. This is analogous to the argument that the opposite of nothing is everything. As a material property, white things reflect all wavelengths of light. In practice, most colors perceived as black reflect some light such that they are tinged with color. The following are examples of complements for black colors.Black
#000000
White
#ffffff
Alien Black
#1a2228
Pastel Beige
#e5ddd7
Black Bean
#4e4b4a
Steel Grey
#b1b4b5
Charcoal
#36454f
Raw Sugar
#c9bab0
Blackened Brown
#442200
Baby Blue
#bbddff
Gothic Grape
#120321
Pastel Melon
#edfcde
Raisin
#524144
Deco Gray
#adbebb
Midnight Grey
#080808
Lynx White
#f7f7f7
Dark Rosewood
#3c0006
Crushed Ice
#c3fff9
Very Dark Brown
#140100
Skylight
#ebfeff
Very Dark Purple
#0f0012
Imperial Mint
#f0ffed
Volcanic Sand
#404048
Cement Grey
#bfbfb7
Young Night
#232323
Gainsboro
#dcdcdc
Warm Black
#000d0d
Light Cherry Blossom
#fff2f2
Very Dark Green
#031701
Strawberry Yogurt
#fce8fe
Very Dark Blue
#000023
Vanilla Yellow
#ffffdc
Jet Black
#2d2c2f
True Grey
#d2d3d0
Licorice
#1a1110
Cloud Grey
#e5eeef
Notes
Black is a color because it is perceived as a color. Color is a feature of human and animal perception and not a property of the universe. That is to say that there are large differences between color and the underlying wavelengths of light. For example, white is actually a rainbow of different wavelengths of light that maps to a single color in the mind.Sunlight is white. The conversion of all colors to a single color is an adaptation that makes the world more comprehensible. If we were constantly flooded with rainbow colors, sight might be too complex.Of all complementary colors, white and black have the highest contrast. Both white and black are also perceived as neutral and calming. This is the reason that books are published with black text and a white background as this maximizes contrast and feels comfortable. Another set of complements, such as blue and yellow would be hard on the eyes. In design, a black background and white text also works quite well. This isn't as popular for physical publishing as it may require more ink or dye.