Many times, whenever we boil an egg we see the grey colour ring in between egg yolk and egg white (we can see the image below). So, Why this forms????
Actually, the egg yolk contains iron and the white (albumen) contains sulfur. During boiling the sulfur atoms are liberated and react with hydrogen ions in the white to form hydrogen sulfide (a gas). As gas forms, it diffuses in all directions and some reaches the surface of the yolk, where it encounters iron and reacts to form dark particles of ferrous sulfide.
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