The main component of egg shell is calcium carbonate. The small pores on its surface can exchange gas with the outside world. When ink is applied, it will block the pores, but this has little effect. The most important thing is the ink molecules. It will penetrate into the eggs and cause secondary pollution to the eggs. Organic solvents such as ethanol, isopropyl alcohol, butanol, propanol, butanone, ethyl acetate, butyl acetate, toluene, and xylene are often used in inks. These chemical components are harmful to the human body. Simply put, they are harmful to the eyes, respiratory tract, The liver, kidneys, and brain are damaging and carcinogenic. Of course, a few eggs won't have any impact. Long-term consumption will cause adverse consequences to human health.