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CSIRO scientists have cracked cotton's molecular colour code, adding genes to make the plants produce a colour.
While cotton is renewable, recyclable and biodegradable, it still needs to be dyed, and the use of sometimes harmful chemical dyes is considered a blot on the industry's environmental copybook.
A move away from synthetic materials in favour of cotton would be an important step in protecting the environment. Synthetic microfibres end up staying in the environment and can do more damage than regular plastic.
https://www.abc.net.au/news/2020-06-27/csiro-scientists-grow-coloured-cotton/12395250
Lou Conway