Great question was posted today, "Please suggest three colors in the earth tones that will give me a deep, rich, brown color with no hints of red?"  Colleen Schaan to the rescue once again with a great run down of what you can expect from the earth tones:

Stay away from the E0's, E1's, E2's. The E3's are a good rich brown. The E4's will give you a desaturated (grayish) brown, the E5's will give you an olive brown, the E7's give a nice brown with a mauve undertone - but I like this for really rich browns... reminds me of coconuts, the E8's will give you a green brown and the E9's will give you a terra-cotta brown.