The tone, shade or hue (in English Hue) is one of the properties or fundamental qualities in the property of a color, defined technically (in the CIECAM02 model), as «the degree to which a stimulus can be described as similar or different from stimuli like red, yellow and blue ». It refers to the property in the qualitatively different aspects of the color experience that are related to differences in wavelengths or to mixtures of different wavelengths. It is the pure state of color, without mixing white or black and, together with luminosity and saturation, one of the three psychophysical characteristics of color.