C2.12 Chromatography

C2.12 Chromatography

1. Most Inks, paints and food colouring are made of a mixture of colours.

2. Chromatography can be used to separate the different colours in the mixture.

3. Paper chromatography

   • Solvent front is where the line where the solovent reaches
   • The more soluble compounds are carried up the paper faster than the others

4. Rf values

   • Rf = distance moved by compound / distance moved by the solvent
   • The Rf values are always the same

5. Chromatography can be used ..

   • to check which colourings are used in food.
   • In crime scenes to analyse paints and inks
   • In museums to check for forgery or resoreation