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Lycopene
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===Staining and removal=== Lycopene is the [[pigment]] in tomato sauces that turns plastic cookware orange. It is insoluble in plain water, but it can be dissolved in organic solvents and oils. Because of its non-polarity, lycopene in food preparations will stain any sufficiently [[porosity|porous]] material, including most plastics. To remove this staining, the plastics may be soaked in a solution containing a small amount of chlorine bleach.<ref>{{cite news|url=http://www.huffingtonpost.com/chris-barnes/how-to-clean-tomato-sauce_b_1521201.html|title=How To Clean Tomato Sauce Stains From Plastic Storage Containers|author=Barnes, Chris|date=11 October 2011|work=The Huffington Post|access-date=29 May 2017}}</ref> The bleach oxidizes the lycopene, thus rendering it colourless.
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