It’s amazing how much of everyday life I didn’t question for years – like what “wi-fi” really means, where we get paprika from, and what ASDA actually stands for. And opening my fridge this afternoon, another banal mystery confronted me. What’s that squidgy black mat at the bottom of raspberry trays for, and why isn’t it in the bottom of my strawberry tray? It seems I’m not alone. Posting to r/NoStupidQuestions, Redditor u/GrumpyOldSophon asked about the addition, wondering why you “never find this in packages of blueberries or strawberries”. The sheet is absorbent, but it may have other qualities It probably won’t shock you to learn that the sheet is there to absorb some moisture. Packaging specialists Packaging World described these sheets as “dual ply absorbent” material, “applied to a totally absorbent, yet sealed, topcoat”. 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 …