Acupuncture Sand

【Name】

Acupuncture Sand

 【Source】

Bencao Gangmu Shiyi (Supplement to the Compendium of Materia Medica)

 【Frequency of Use】

E

 【Origin】

It is the fine filings that are ground off during the manufacturing of steel needles.

 【Characteristics】

It is a fine powder that is black or gray-brown in color, interspersed with a small amount of fragments no larger than 0.05 cubic mm. It has a metallic luster and is heavy and firm.

 【Identification】

The finer the better; coarse ones are not suitable for use. It is genuine if it can be attracted by a magnet and form a long strip. It is of good quality if it emits sparks and crackling sounds when burned.

 【Category】

Minerals