Identification of natural leather and leather imitation materials?

Natural leather (commonly known as dermal) has natural pores and skin lines on the surface layer, and the upper joint is cut. From the surface to the inner layer, it is a process of tissue change from dense to loose. And there are leather fibers. If you take a little ignition with the hair burning when the burnt dark.
Imitation leather material (commonly known as fake leather) without leather fiber, it is in nonwoven cloth, woven fabric coated with a layer of plastic resin processing, from cutting. And the back can be seen non-woven or woven fabric base, lit up after the chemical raw materials smell.