Contrast of Redox

• Contrast refers to the degree of visual distinction between associated colors

  • Faint -- evident only on close examination.
  • Distinct -- readily seen.
  • Prominent -- contrast strongly.

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Contrast of mottles is important. Contrast can be obtained from color charts, just make sure to describe the colors.

For hydric soil determinations, mottles should be either distinct or prominent. Faint mottles don’t mean much to experienced soil scientists.