and Test Tones
The name of the color comes from visible light that turns pink when a similar spectral distribution is applied.
For the human auditory system - which processes frequencies logarithmically - pink noise is supposed to sound even across all frequencies, and therefore best approximates the average spectral distribution of music.
In practice though, it turns out that our ears are more sensitive to certain frequencies, such as in the 2–4 kHz range. Pink noise, despite of its even frequency distribution in the logarithmic frequency scale, will therefore be perceived as colored, with a prominent peak perceived around 3 kHz. Flattening a noise in a perceptual way, will generate grey noise.
Pink noise can be used to measure the adverse effects of room modes as well, although a low frequency sine sweep will be better for such a purpose.
In healthcare applications, pink noise is used to treat hyperacusis, an increased sensitivity to normal environmental sounds, or to mask tinnitus, a ringing in your ear occurring without any stimulus.