Why Do Raspberries And Blueberries Have Black Sheets Under Them, But Not Strawberries Or Grapes?
They’re designed for softer fruits, like raspberries and blueberries, as these aren’t as hardy as, e.g., strawberries or grapes. Speaking to Eating Well, Robert Schueller, a produce expert at Melissa’s Produce, said: “A raspberry is one of the most delicate fruits out there, so they have to be packaged very carefully”.
Article source: https://www.huffingtonpost.co.uk/entry/raspberries-black-sheet-strawberries_uk_69c6a31be4b041837420817f