Tanning is the process of converting putrescible skin into non-putrescible leather, usually with tannin, an acidic chemical compound that prevents decomposition and often imparts color
making leather from rawhide process in which skin pigmentation darkens as a result of exposure to ultraviolet light
Chemical treatment of raw animal hides or skins to convert them into leather. Vegetable tanning (using bark, wood, roots, or berries) has been practiced since prehistoric times. After removal of hair, flesh, or fat, a tanning agent displaces water from the interstices between the protein (mostly collagen) fibres in the skin and cements the fibres together. The agents most widely used are vegetable tannin, salts such as chromium sulfate, and fish or animal oil. The tanning of fair skin in humans by sunlight is completely different: ultraviolet light causes production and redistribution of the pigment melanin in epidermal cells
process in which skin pigmentation darkens as a result of exposure to ultraviolet light