Why do we observe a greenish ring around the yolk of hard-boiled eggs?
Why do we observe a greenish ring around the yolk of hard-boiled eggs? The greenish ring around the yolk of a hard-boiled egg is caused by a harmless chemical reaction between sulfur in the egg white and iron in the yolk. The resulting compound is called ferrous sulfide, which forms a greenish-gray color where the white and yolk meet. Detailed Explanation … Read more