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The green, red and blue dyes in plastic milk bottle tops used in many countries are a real problem, says material scientist Sujata Kundu. The colours are hard to separate from the main plastic polymer and, as green tops are the most popular in the UK, the recycled plastic tends to have an un-appetizing green tinge. So Sujata wants us either to switch to colourless bottle tops, or, better still, change to an exciting colour, such as purple, so that recycled plastics become widely accepted.