Tanning is the process of making leather from animal skins using tannin or other chemicals. It permanently alters the protein structure of skin so it does not decompose. Historically, tanning was an unpleasant process done on the outskirts of towns. Modern tanning involves four stages - preparation, tanning, retanning, and finishing. Preparation includes curing and liming hides to remove hair and fats. Chelsi Leather produces various leather goods from hides like cow, buffalo, goat, fish and snake for bags, shoes and more.