Why does a green ring appear around hard-boiled eggs?

Start Cold: Place eggs in a pot and cover with cold water, about 1–2 inches above. Heat Gently: Bring to a rolling boil over medium heat, then immediately turn off the heat. Let Sit: Cover and leave the eggs in the hot water: 9 minutes for soft yolks 11–12 minutes for firm yolks Cool Fast: Transfer eggs to an ice...

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