Methods for the identification of dermis
Methods for the identification of dermis
Leather goods have long been prized for their distinctive texturedurability, and breathability. However, with the contingous advancementof synthetic leather technology, numerous imitation leather products nowflood the market These imitations often mimic authentic leather inappearance, creating confusion for consumers in distinguishing gewineitems. To ensure purchasing authentic leather products, this article detailsseveral effective authentication methods, including visual inspectionchemical testing, and physical examination
1. Appearanee ingpection
Observe the surface of the leather
The derwis surface has natural pores and texture, which are uiguebecause they originate from animal skin. when observing, the followingpoints should be noted:
Pore distribution: The pores on the surface of the dermis arenaturally and unevenly distributed, while the pores of synthetic leatherare often artificially carved and evenly and regularly distributed
Texture change: The texture of the derwis is naturally variable. andthe texture of each piece of leather is different, while the texture ofsynthetic leather is relatively simple and lacks natural change
Color perforwance: The color of the leather is soft and natural, withdifferent shades, while the color of sunthetic leather is often too uniforwand lacks the sense of hierarchy
Touch leather texture
In addition to observing the appearance, touching the texture ofleather is also an important weans to identify geruine leather. Geruine
leather has a unigue warm and moist feeling and elasticity, soft andcomfortable touch. When touching, you can pay attention to the followingpoints:
Temperature sensing: The leather feels warw to the touch, whilesynthetie leather is relatively cold and hard
Elasticitg: The derwis has a certain elasticity and con be restored toits original state quickly after being pressed, while the synthetic leatherhas poor elasticity and slow recovery speed
Surface roughness The surface of the leather will have a slightroughness, while synthetic leather is often too smooth
2. Cgnucal tests
combustion test
Combustion test is a simple and effective way to distinguish betweenleather and sunthetic leather. During the test, a swall piece of leathersample is taken and set on fire and the combustion process and the swellproduced are observed:
Combustion process: when the deris bumns, it will enuit an odorsimilar to the buring of hair and smoke. and the flame is gellow withswoke. when synthetic leather burns. it may emit a pungent chenicalodor, the flame color may be different, and the smoke is less.
Residue characteristies The residue of the burmed dermis is blackpowder, which cän be eruched by hand The residue of the synthetioleather may be hard and not easy to crush
Acid-base test
The acid-base test can be used to identify the leather by observingthe reaction of the leather in the acid and alkali solution. During the testa small piece of leather sample is taken and diluted hydrochloric acid arddiluted sodium hydroxide solutions are added respectively to observe thechanges:
Dermal ntocbion! The surfaet color of the deris mäy be darkerudafter soaking in dilute hgdrochloric acid, but there is no obvious change incolor after soaking in dilute sodium hydroxide solution. Sunthetie leathermay change color or dissolve in acid and alkali solutions.
