Andi is undertaking the Walkley-Black method to analyse carbon in #soil. The method uses potassium dichromate, an orange solution. Carbon is oxidised by chromate ions (orange), and more carbon the less orange the solution becomes. Colours will range from orange (no carbon) to green to dark blue and nearly black (more carbon). 

Andi is undertaking the Walkley-Black method to analyse carbon in #soil. The method uses potassium dichromate, an orange solution. Carbon is oxidised by chromate ions (orange), and more carbon the less orange the solution becomes. Colours will range from orange (no carbon) to green to dark blue and nearly black (more carbon).