What are the significance of stool colors and consistencies with regards to the ailing body organ?

Stools colors can tell you many different things about your body.

Causes of black colored stools (known as melena)

acidified blood

blood from higher in the digestive tract

iron supplements or foods high in iron

Pepto-Bismol or other medicines containing bismuth

black licorice

large amounts of spinach or other greens

blueberries

aspirin

other foods dark in color such as chocolate sandwich cookies (Oreos)

Causes of red colored stools (known as hematochezia)

blood

hemorrhoids

red gelatin, popsicles, or Kool-Aid

tomato juice or soup

large amounts beets

Causes of pale or clay colored stools

lack of bile salt (bile salt gives stool its brownish color)

antacids containing aluminum hydroxide

barium from a recent barium enema test

hepatitis

Causes of green stools

large amounts of green, leafy vegetables

green or purple artificial coloring (popsicles, Kool-Aid, gelatin)

iron supplements

rapid transit or decreased colonic transit time

Causes of orange colored stools

some medications (such as beta-carotene and rifampen)

foods high in beta-carotene: carrots, sweet potatoes, apricots, winter squash, pumpkin, cantaloupe, and mangoes

If a change in stool color cannot be attributed to a dietary reason, or is accompanied by any other symptoms (such as diarrhea, constipation, weakness, or dizziness), a doctor should be consulted

I know that a healthy stool is generally "s" shaped and a nutty brown color.