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將濾紙浸入溶液中,即由于濾紙纖維间的毛管作用,吸上溶液。在溶液上昇过程中,容易被滤紙纖維吸附的溶質成分,停止于濾紙之下方,沒有被吸附性的,即随着溶媒上昇,到溶媒逐漸揮發后,析出結晶或沉淀,沉积于濾紙之上方。此外,溶液表面張力之大小,各种溶質的不同溶解度,也会影响溶質在濾紙上停留的位置,因而,现出各种各样的色帶(Zone)或螢光帶,組成固有的毛管像。同一种生药在不同地点和时間而在相同情况的条件下,进行作像时,均可得到相同的毛管像。我們可以根据毛管像中各种色帶的顏色,形狀,大小,螢光现象及其在濾紙上的位置等特征,並于必要
The filter paper is immersed in the solution, which is due to the capillary action between the fibers of the filter paper. During the rising of the solution, the solute component that is easily adsorbed by the filter paper fibers stops below the filter paper and is not adsorbed. That is, as the solvent rises, after the solvent gradually volatilizes, the precipitated crystals or precipitates deposit on the filter paper. In addition, the surface tension of the solution and the different solubilities of the various solutes also affect the position of the solute on the filter paper. Therefore, various zones or fluorescent bands emerge to form an inherent capillary image. . The same capillary image can be obtained when the same crude drug is imaged at different locations and times under the same conditions. We can according to the characteristics of the color, shape, size, fluorescent phenomenon and its location on the filter paper, and necessary