Write on raw eggs with vinegar, dry, cook and peel. I didn't find any words. Why?

It may be that the vinegar is used too little, or the vinegar at home has been left for a long time, and the acetic acid in it has evaporated.

It is common to write on raw eggs: write on eggshells with acetic acid, and when the acetic acid dries, there is no trace. But if the egg is cooked again, the handwriting will miraculously be printed on the egg white through the eggshell.

Note: Ensure the concentration of acetic acid; Write more times, dry and then write, dry and then write; Don't boil eggs after acetic acid permeates for a period of time. Don't cook it immediately after you finish it. (Vinegar contains a small amount of acetic acid, and the main component of eggshell is calcium carbonate. The two react, calcium carbonate melts, so there will be words. )

Extended data:

The result of the reaction of acetic acid with other substances. The main component of eggshell is calcium carbonate. When writing with acetic acid, acetic acid reacts with eggshell calcium carbonate to generate calcium acetate, and then acetic acid reacts with egg white through eggshell. Egg white is soluble protein.

Protein is a chain polymer compound composed of amide bonds formed by dehydration of several α -amino acids. It is not very stable. Under the action of heat, ultraviolet rays or chemical reagents such as nitric acid, trichloroacetic acid, tannic acid, picric acid, heavy metal salt, urea, acetone, etc. Protein solidified, denatured, and the infiltrated acetic acid reacted with the egg white, leaving a special mark on the egg white. After the eggs are cooked, there will be clear and legible handwriting.