anamorphosis

Anamorphosis of hammer,from patina and shape,it's in late Ming and early Qing dynasty...

锤,浆和型制看为明末清初...

There are two allotropes, yellow anamorphosis is stable under 90 centigrade.Stability form of antimony is metal anamorphosis.

有两种同素异形,黄色在负90度下稳定，金属是锑稳定形式。