Iron (II) sulphide from boiled egg

Applause IconApr 21, 2019 • 4:11 PM UTC
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Puchina

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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
And here is the birefringent Iron II sulfide under polarized light!

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