第一招是看断面。像何首乌这样块状药材,正品表面黑褐色或棕褐色坚硬,断面一样也为棕褐色或黑色。染色品表面呈黑色,断面颜色明显浅表面,不呈角质样。第二招是用手摸。染过色的药材般色泽鲜艳,但不亲手感受一下,还难以判断。比如像枸杞这样常易被染 The first one is to see the section. Polygonum multiflorum herbs like this, the authentic surface dark brown or brown hard, cross-section, also for the tan or black. The surface of the dyed product is black, the color of the cross section is obviously superficial, and it is not keratinized. The second trick is to use hand touch. Dyed herbs like bright color, but not personally feel, but also difficult to judge. Such as Chinese wolfberry so often easily dyed