THE identification of non-volatile organic acids on paper chromatograms is usually dependent on the use of a suitable pH indicator which is applied to the developed and dried paper by spraying 1.

As the solvent soaks up the paper, it carries the mixtures with it. Different components of the mixture will move at different rates. This separates the mixture out.

There are several ways that you could investigate the composition of inks. This is an outline of the required steps to undertake one of these methods. It is important in this practical activity to ...