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The Federal Standard 1037C Telecommunications Glossary defines white, pink, blue and black.

    http://www.its.bldrdoc.gov/fs-1037

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White noise:

  Noise having a frequency spectrum that is continuous and uniform over a specified
  frequency band.

  Note: White noise has equal power per hertz over the specified
        frequency band. Synonym additive white gaussian noise.



Pink noise:

  In acoustics, noise in which there is equal power per octave.



Blue noise:

  In a spectrum of frequencies, a region in which the spectral density, i.e. , power per
  hertz, is proportional to the frequency.



Black noise:

  Noise that has a frequency spectrum of predominately zero power level over all frequencies
  except for a few narrow bands or spikes. Note: An example of black noise in a facsimile
  transmission system is the spectrum that might be obtained when scanning a black area in
  which there are a few Random white spots. Thus, in the time domain, a few Random pulses
  occur while scanning.



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