Colour: The Spectrum of Science

BBC Four HD

11:40 PM to 12:40 AM

Tuesday 17 November

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Helen Czerski examines the complexities of colour, including what it is, how it works, and how it has written the story of the planet. In the first edition, she looks for the colours that have made the earth multi-coloured, investigating the essence of sunlight, how vivid blue is formed from sulphur atoms, and why the presence of red ochre is a key sign of life. She also looks at why gold should not even exist on the surface of the planet, and the role of salt and water in shaping planet earth