Mulberry silk is made of natural silk protein, while fake silk is mostly polyester or nylon. Here ar...

Silk is natural protein fiber with delicate texture. Improper washing will cause fading, shrinkage, ...

翡翠是以硬玉为主的许多纤维晶体致密交织成的矿物体，硬度 6.5—7级，颜色几乎包括了自然的所有颜色，密度3.30—3.34。同时具有其它宝石不具备的典型特征———翠性，所谓翠性就是一种用裸眼仔细观察或...