Nik Turner - Noise

WHITE: Constant, continuous, uniform - equal power across a finite band (appears 'top-heavy') - aka "Johnson"
BLACK -> R.I.P. (dearly departed): Catastrophic - zero-power (aside from a few spikes, often clustered) - aka "Silent"
GREY: Psychoacoustic - given range 'bent' over an equal loudness curve (such as an inverted 'A-weight' curve) - sounds equally loud at all frequencies (to humans).
PURPLE: Differentiated - magnitude proportional to square of frequency - aka "Violet"
BLUE -> Voice of the Thunder Rider (newsletter archive): Regional - magnitude proportional to frequency (good for dithering).
GREEN: Background noise of the world. Really long term-power spectrum averaged over several sites. Rather like pink noise with a hump around 500 Hz - aka "New Age"
YELLOW: "Watch out how the huskies poise..." (No such thing as yellow noise?!?)
ORANGE: Quasi-stationary - finite power spectrum, finite number of small bands of zero energy dispersed throughout a continuous spectrum. Bands of zero energy centre about frequencies of musical notes (in whatever system of music is of interest); all in-tune musical notes therefore eliminated, the remaining spectrum consists only of bum notes (in case you ever wondered from whence those all come).
RED: Oceanic ambient noise (distant from the sources) - selectively absorbs higher frequencies.
PINK: Random - magnitude inversely proportional to frequency - aka "Flicker"
BROWN: Magnitude inversely proportional to square of frequency - aka "Random Walk" or "Drunkard's Walk" (Brownian Motion).