Glowing, colour-changing polymer These polymers, seen here under UV light, are composed of the exact same components. The only difference is their chain length. Credit: Suiying Ye / ETH Zurich An international team of chemists, including some Australians, have developed a type of polymer that can glow in a broad range of colours. Fluorescent molecules are useful for lighting, solar cell research, medical imaging, and biological lab tests like PCR tests, among other things. It can be difficult to achieve precise colours in fluorescent dyes, and manufacturers often have to mix very different compounds together to get to certain colours. But a new paper published in