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The eggshell membrane is the protein-rich, inedible part located between the egg white and the eggshell. The proteins present in eggshell membranes are in the form of collagen and are in great demand in the cosmetics industry. In addition, technological advances and critical thinking by researchers have highlighted the effectiveness of eggshell membranes in a variety of industrial and technological applications. Calcium oxide is derived from eggshell membranes and has many uses in the petrochemical, agricultural, cosmetics, animal feed, pharmaceutical and tanning industries.