The specific principles please space http://hi.baidu /meipiwang/home read: leather, purses, shoes and other leather why hard, hard? Concerned about leather care points and shoes errors, article chain http://hi.baidu /meipiwang/blog/item/0f6a0d33373bd4f81a4cffee.html
The problem is that the temperature of the skin is increased: the temperature of the oil molecules increases, and the energy of the oil molecules increases. When the temperature rises to the energy that the oil molecules have volatilized from the skin, the intradermal oil evaporates from the skin , Harden the dermis, and then crack
So leather products can not be sun, do not place the location of the sun, or with objects such as cloth to block the sun. If you really can not do sunscreen, it had to every two months with a black bottle (product milky white, does not affect the color of the skin, the same under the skin)
