Iron (II) sulphide from boiled egg
Apr 21, 2019 • 4:11 PM UTC
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Raman Joshi
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The dark ring we see when we overboil an egg is caused by the reaction of Iron in the yolk reacting with sulfur in the albumin. This produces Iron II sulfide.
Here you can see the dark Iron II sulfide with plane polarized light
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And here is the birefringent Iron II sulfide under polarized light!
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