1. Seeing: Observe true leather surface has clearer pores, patterns, cattle skin has a more symmetrical fine pores, yak skin has thicker and sparse pores, goat sheepskin has fish squamous pores, pigskin have triangular coarse pores, and artificial leather, although also imitation of the pores, but not clear.
2. Ignite: From the real leather and leather from the back of a little fiber, lit, where the pungent odor, formed a pimple is artificial leather, hair smell, not knot hard knot is the dermis.
3. Smell: All true leather has the smell of leather, and artificial leather has a strong plastic odor.
4. Feel: Touch leather surface with hand, if have smooth, soft, plump, the feeling of elasticity is dermis, but the general synthetic leather surface is astringent, inflexible, soft sex is poor.