It is unsafe to place egg shells back in the carton with the other eggs and refrigerate. Some feel it can result in cross-contamination & the spread of dangerous microorganisms.
Salmonella can be present both within the egg and on the shell of an egg. Placing cracked, empty eggshells back in the carton raises the danger of egg contamination.
Eggs commonly carry Salmonella. The infection passes from the chicken's excrement to the egg during laying.
Salmonella can be found inside eggs when salmonella on the shell of the egg is absorbed through the egg's pores.
As a result, returning the cracked, empty shells to the carton raises the risk of contaminating the remaining eggs.
When cracking eggs, you should always have your countertop compost container adjacent to the bowl. Toss the shells into the trash as soon as they've been cracked open.
Baum, who has worked in food safety for more than 25 years, says she has never heard of someone getting sick after reusing an eggshell.
Consumers, on the other hand, still need to practice excellent food safety in order to minimize the danger of illness.