We are delighted to welcome back Dr Jamie Gallagher to Chemistry in Action with a very special session dedicated to colour. Since the earliest days of chemistry, colour and appearance have been used to understand the nature of materials. Now in the 21st century, we can understand and control chemical colour as never before. From the quantum confinement effects of nanomaterials to the conjugated double bonds systems of organic molecules, colour chemistry is complex and beautiful. Explore this extraordinary world with Jamie and discover how it is being used to tackle some of the world’s biggest problems.