How can blood turn black?

Answer 1

Yes Blood can be black. Too much iron will usually turn the blood black. However, if there is liver failure, and it's seeping into the blood stream that too can cause the blood to turn black as it becomes over loaded with toxins. Put simply it's the blood is overloaded with toxins and other nutrients that the body can't process entirely.

Answer 2

No, all people have red blood.

The color of peoples skin varies because some peoples' ancestors lived in places where the sun is strong (near the equator) and some where the sun is weak (the northern and southern latitudes). In the northern and southern latitudes a light colored skin allows the sunlight to react with the tissues under the skin to form vitamin D (needed to make strong bones) easily and thus having a light skin is an advantage. Near the equator a light skin is damaged by the sunlight while a darker skin with more pigmentation can withstand this sunlight and thus in these latitudes having a dark skin is an advantage.

Thus in places where the Sun is strong black skin becomes the dominant skin color and where the Sun is weak a light skin becomes the dominant.

Answer 3

If there is a lot of heat. For instance, black pudding is just fried sheeps blood