Chemistry C2 - Chemical Analysis and Instrumental Methods

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Artificial Colourd can be Seperated using Paper Chromatography 

- a food colouring might contain one dye or it might be a mixture of dyes; heres how you can tell: 

1) extract the colour from a food sample by placing it in a small cup with a few drops of solvent (water, ethanol ect) 

2) put spots of the coloured solution on a pencil baseline on filter paper 

3) roll up the sheet and put it in a beaker with some solvent - keep baseline above level of solvent. 

4) the solvent seeps up paper, taking the dyes with it - different dyes for spots

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