Carefully cut the slice with a thin strip of skin and ignite it. Will give a fake synthetic chemical smell. Natural material will not burn and smolder. In this case, you will feel the smell of burning skin. Remember that a well-made imitation smolder after special treatment as well as leather.
Natural smell of genuine leather should not be too sharp and unpleasant. If you are caught like a specific "flavor" is likely a fake in front of you, treated with a special compound that mimics the smell of natural material.
Consider the wrong side and raw slice of the product. In genuine leather and it is non-woven pile, but it will not delaminate. Slice of artificial leather has sealed a flat edge. The structure of the wrong side should be flat and smooth to the touch like a chamois. It should not be stains. Wrong side of the artificial skin is a fabric base.
Lightly rub the skin on the face of the product. It should not remain cracks and breaks. Paint delamination or from the front or from the wrong side.
Put a little water on the material. Genuine leather absorbs moisture, and on its surface will be dark spot, which disappears after drying. With faux leather drops of water will slide off.
Touch the skin by hand. Natural skin very quickly transfer your warm and artificial remain cool and it will be visible wet stains.
Test the elasticity. Once you bend the product appearing on it wrinkles should disappear quickly. On artificial skin, they will remain.