It is used to separate two or more dissolved solids in a solution. We have several types of chromatography but all have the same basic principles;

It uses the different solubility of each solid particle in a solvent. Two phases are involved; the stationary and the mobile phase.

1. Paper chromatography

This is the simplest type of chromatography used to separate coloured substance ( Dyes and Pigments ) in a sample of black ink.

Experiment in separating the dyes in black ink

Aim: to separate the pigments in black ink

Apparatus:

• Filter paper
• Black water-soluble ink
• Glass beaker
• Water
• Permanent ink
• Methylated spirits

Diagram:

    par Claude Foumtum