What can I do to make blood black?

In my world I find it simplest to have iron-based blood. The problem is that iron-based blood is red, and I want it to be black. Two things come to mind; one is making the blood denser, resulting in thicker, darker blood and fast bleeders. The other is making blood richer in iron, which leads to black blood, but the threat of heavy metal poisoning. I am not a expert so I don't know if those would even work. What can I do to make iron-based blood black, and what would the effects be on creatures' bodies?

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What can I do to make blood black?

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