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Iron(II) sulfide

physical science Maturity 7-9

Some things are black and solid.

Overcooked hardboiled egg cut in half.jpg
Overcooked hardboiled egg cut in half.jpg
This can form in a hard egg. It makes the yolk look green. It happens when you cook it too long. Have you seen a green egg? It is a fun thing to find.

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File:Overcooked hardboiled egg cut in half.jpg
Overcooked hardboiled egg cut in half.jpg
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