What does it be set to when my stool is shade green or almost black?

What does it be set to when my stool is shade green or almost black?
Stool colors
http://www.mayoclinic.com/health/stool-c...
http://ibdcrohns.about.com/cs/otherdisea...
http://www.med.umich.edu/1libr/pa/pa_unc...
Did you pinch any pepto the last few days? Eat abundantly of spinach?
Do you take iron? Iron pills can get your stool dark.

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