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This also occurs even if the skin is partly impermeable to water. Leather, in fact, is a unique material which prevents liquids from passing but not gases or vapors.
In tanning there is an important distinction between the upper part of the dermis (in contact with the epidermis, which makes up what is called grain leather and is characteristic of each different type of animal) and the part below (reticular layer) which is called the split.
a. Cheek, b. Face, c. Shoulder, d. Fore shank,e. Belly,f Bend,g. Butt,h. Belly middle,i. Hind shank
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