I think you may be talking about blood oxygen levels. Oxygenated blood is bright red whereas non-oxygenated blood is a very dark red that looks like a wine red (red wine can sometimes appear black).
You still might want to go see a doctor in case your blood is, in fact, darker than normal and you have some sort of condition that requires medical attention.
Is it normal that my blood is almost black?
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I think you may be talking about blood oxygen levels. Oxygenated blood is bright red whereas non-oxygenated blood is a very dark red that looks like a wine red (red wine can sometimes appear black).
You still might want to go see a doctor in case your blood is, in fact, darker than normal and you have some sort of condition that requires medical attention.