tanning

Tanning converts the otherwise perishable skin to a stable and nondecaying material.

制革把容易腐烂的动物皮转换成稳定的、不会变质的材料。

Using the syntan to pretan vegetable-tanned sole leather ,the quantity of tannin extract can be reduced in vegetable tanning.

该合成剂用于植底革的预,可减少植时栲胶的用量。

Pass the tanning by the sun the easy deterioration too of water quality of sunshine, even water very shallow, can because thickness high to look the fish in green algate too.

经的曝水质也容易恶化，即使水很浅，也会因为绿藻浓度高看不到鱼。