Hello,
Black stool can be from things you have eaten (licorice, bismuth, lots of dark green vegetables, some dark foods with dyes, etc.) or from bleeding high in the digestive tract (gastric or duodenal ulcer). This is something that needs to be investigated by your GP if it lasts for more than a very few days.
http://www.medicinenet.com/script/main/forum.asp?articlekey=24701
http://www.nlm.nih.gov/medlineplus/ency/article/003130.htm
If you need further clarification, please ask.
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