One of those fantasy novels where a little boy has a vision of heaven during a near-death experience (like Heaven is for Real or The Boy Who Came Back from Heaven), except instead of Heaven, he goes to Hell.
One day, I shall make the news feed. Then they'll see. Then they'll all see! Mwahahahaha!!!!
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Even "de-oxygenated" venous blood still has a good 75% oxygen saturation, and while initial blood contact with the air can almost reach the high saturation that arterial blood has (roughly 99%) this quickly diminishes due to red blood cells dying. Therefore, after any prolonged exposure to to the air, blood will take on a darker colour, and this process is quicker with venous blood due to the lower overall saturation level.
If you're going to be a pendant, at least be meticulous about it.
...especially if its venous blood.