JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Lipstick. Red lipstick against a straw background. Most lipstick products contains wax derived from petroleum. Scientists from the Green Chemistry Group at the University of York, UK, have developed a method of extracting wax from waste wheat straw. The technique, known as supercritical extraction, avoids the use of toxic solvents, by extracting compounds using carbon dioxide and high pressure.
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