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IMPORTANT NOTE on Soil Contrast (May 2002): http://soils.usda.gov/technical/technotes/note2.html

Notes:

• 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.