In this experiment the dye travelled 31mm and ... practical to investigate the separation of substances using paper chromatography for GCSE chemistry and combined science. This short film begins ...

A pencil line is drawn, and spots of ink or plant dye are placed on it. There is a container of solvent, such as water or ethanol. A pure substance will only produce one spot on the chromatogram ...

One way they can do this is to use a process called chromatography. In the activity below ... The reason why the colors separate has to do with the chemicals that make up the color, the water, and the ...