Eggshell is made almost entirely of calcium carbonate (CaCO3) crystals. It is a semipermeable membrane, which means that air and moisture can pass through its pores. The shell also has a thin outermost coating called the bloom or cuticle that helps keep out bacteria and dust.
What is the function of a egg shell?
The calcified eggshell provides protection to the egg contents and embryo against physical damage and contamination by microorganisms. This complex bioceramic also regulates the exchange of metabolic gases and water, and provides calcium to the developing embryo.
What does egg shell mean?
1 : the hard exterior covering of an egg. 2 : something resembling an eggshell especially in fragility.
