Kevin Keener, Purdue University (IMAGE) Purdue University Caption Kevin Keener's in-bag ozonation method creates ozone in packaged foods by using high-voltage coils to charge the gas inside sealed food packages, effectively killing any bacteria inside them. In this demonstration with a bag of tomatoes, helium has been added to a plastic bag because it glows, showing the ionization process. Credit Purdue Agricultural Communication photo/Tom Campbell Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.