What would cause a hard boiled brown egg to turn green other than being rotten?!

Question:

What would cause a hard boiled brown egg to turn green other than being rotten?

Egg was brown cage free organic and not rotten. It was also cooked with several other eggs that did not end up green. Again, the egg was not rotten. The white was green. It was hard boiled. Any clues?

Additional Details

3 days ago
OK thanks folks, however, it was the same size and cooked in a pot with several other eggs that were not green. Any ideas other than cooked too long?

Answers:

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3 days ago
OK thanks folks, however, it was the same size and cooked in a pot with several other eggs that were not green. Any ideas other than cooked too long?

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The hen that laid the egg may have had a diet that was high in iron.

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you could have cooked it to long . sometimes it makes eggs turn green

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Did you boil greens in the pot and not wash it thoroughly afterwards? No idea

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Why do eggs sometimes turn green when cooked?
When eggs are cooked for too long or at too high a temperature, they will sometimes turn green. Color change may also occur if the cooking water contains a high level of iron. Although the green tint does not affect flavor or wholesomeness, it may be avoided by cooking at low temperatures and using stainless steel equipment

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