Leather is animal skin that has undergone chemical processing and physical means such as dehairing and tanning, and is already denatured and not prone to decay. Leather is composed of natural protein fibers tightly woven in three-dimensional space, with a special grain layer on its surface, which has natural grain patterns and luster, and a comfortable feel.In the process of human evolution, it was discovered that some plant juices or mineral oils have a certain degree of tanning properties on leather. The raw leather, soaked in the juice, has better breathability and anti-corrosion properties. Thus, the board has physical and chemical properties such as softness, tear resistance, and resistance to bending. Only during this period did leather truly possess the characteristics of leather products. And this juice is called a tanning agent. The stable tanning agents formed by the development of the leather industry in the mid-19th century can be roughly divided into the following three categories:1. Organic tanning agents: mainly formaldehyde, glutaraldehyde, etc., used for fur and various fine miscellaneous skins.2. Mineral tanning agents: mainly chromium salts and aluminum salts, used for various civilian leather products. Such as clothing.3. Plant tanning agents: mainly tannin extract, used for industrial leather or sole leather.Leather is further divided into genuine leather, recycled leather, synthetic leather, and synthetic leather. How should we distinguish between each other? Let’s talk about it now.How to identify genuine leatherHand touch: Touch the surface of leather with your hand, and if there is a feeling of smoothness, softness, fullness, and elasticity, it is genuine leather; However, the surface of general synthetic leather is astringent, rigid, and has poor softness.At first glance: The leather surface of genuine leather has clear pores and patterns, the yellow cowhide has symmetrical and fine pores, the yak leather has thick and sparse pores, and the goat skin has fish scale like pores.Smell: All genuine leather has the smell of leather; Artificial leather, on the other hand, has a strong irritating plastic odor.Ignite: Tear a little fiber from the back of real leather and artificial leather and after igniting, if it emits a pungent odor and forms lumps, it is artificial leather; What emits a hair odor and does not form hard lumps is genuine leather.distinguishWith the above four basic recognition methods, it is obvious to compare and distinguish artificial leather and synthetic leather. In addition, artificial leather and synthetic leather also have the following characteristics:1. Cut off the edges and burn, it has a smell, but not the burnt smell of hair.2. The leather surface has no pores, which is an important feature for distinguishing the authenticity of leather.3. Pressing the leather surface with your fingers does not show any obvious pores or wrinkles, and if there are wrinkles after pressing, they will not disappear naturally.
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