Chromatography: The process of separation of different dissolved components of a mixture by absorbing them over an appropriate adsorbent medium, is called chromatography.
Paper chromatography: If a filter paper is used as an adsorbent medium for the separation of various components of a mixture using Chromatography, then this method of separation is called Paper chromatography.
Paper chromatography is used to separate two soluble solids which are present in solution in very small quantities.
This method is based on their solubility.
For example Black ink contains a number of different colored dyes in it. By paper chromatography, different components of black ink can be separated.