外观为灰白色、灰绿色或灰黑色粉末，粉末极细，在阳光照射下，一般可见到粉碎的、类似玻璃体的物体存在，闪闪发光。
Look for the gray, gray green or gray-black powder, fine powder, in the sunlight, the general could be crushed to see, the existence of objects similar to the vitreous, sparkling.
本实用新型的优点是可以防止取样称重时极细的粉末化学试剂弥漫飞扬。
The utility model has the advantages that the negative pressure purifying weighing room can prevent ultra-fin powder chemical agents from diffusing and flying when in sampling and weighing.
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