But there are also differences within those areas. The areas marked in red are more than 100 percent stretchable, yellow parts can be stretched from 75 to 100 percent. The stretchability of a chrome-tanned bovine skin varies within the same hide. The stretchability of skin, varies according to the specific tanning process and the part of the skin. Leather consists of infinite fibre connections and permanently changes shape under high pressure. This flexibility also means the leather will stretch over time and, if sufficient force is applied, wrinkles, creases and pressure marks will form that can be as stubborn as embossing. Therefore, leather can be made hard or soft, it can be embossed or deformed (changing the shape without causing damage), it can be ironed or the grain can be reinforced. Leather is a soft, flexible and stretchy material and consists of infinitely small fibres.
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