There are many factors that affect the yellowing of white leather. The first is the tanning process and chemical materials; the second is the production (including shoemaking and ball making) process, especially the glue; the third is the use and Maintenance effects.
The yellowing of white leather is closely related to the processing and coating modification of the base leather. Generally speaking, naphthol has poor light resistance and is easy to turn yellow, while sodium pentachlorophenol antifungal agent has good light resistance and is used to prevent mildew on white leather and is not prone to yellowing; synthetic boot agent has better light resistance and is used for leather blanks. Composite shoe filling has obvious whitening effect; the light resistance of synthetic fatliquor is better than that of animal and vegetable oils, so white leather is suitable for fatliquing with synthetic fatliquor; the higher the purity of the whitening powder and casein used in the coating layer , its light resistance is also better, and the coating is less likely to yellow; during the tanning process, the lower the temperature, the lighter the degree of yellowing of white leather; the less binder, the lighter the degree of yellowing.
In order to prevent white leather products from turning yellow during use, they should avoid direct exposure to sunlight and soaking. They should be stored dry and the moisture content of leather products must be less than 13 %
, otherwise it is very easy to get moldy, especially during the rainy season in the south. When not wearing, it should be dried in the shade. Use a plastic film bag to put mothballs into the leather and seal it for maintenance to avoid the occurrence of mildew. Secondly, apply waxy white care agent frequently to protect the coating layer and reduce the risk of direct sunlight. Strong light can slow down the yellowing of the coating.
