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Crocker and Henderson invented a system of odor classification which has four basic odors which they termed the odor square:

  • Fragrant
  • Acid
  • Burnt
  • Caprylic

They marketed the Crocker-Henderson Odor Classification Set as an educational tool. It contained vials of odorants for comparison, each labled with the basic odor and its position on a nine point scale (odors are rated 0 - 8 ).

However it did not reflect the psychophysical data as it became available and the Heening odor system and Zwaardemaker smell system have taken prominence.

See alsoEdit


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