What took blue food so long to catch on? Today it’s all over the freezer aisle, in candies for kids, in tortilla chips, and novelty foods, but it wasn’t very long ago that food experts agreed: blue food was an impossible sell. Their best evidence was a study from the 1970’s in which subjects were served blue steaks to sickening effect. On this episode, we uncover the strange, misinformation-stuffed history of blue food, the rise of blue raspberry, and what to make of the blue food experiment that made those people sick. It may have something to do with Alfred Hitchcock. This episode was produced in collaboration with Proof, from America's Test Kitchen. Proof is a podcast that investigates the food we love. Subscribe to Proof on Apple Podcasts, Stitcher, or Spotify. Special programming note: Decoder Ring is going seasonal! That means you won’t hear from us for a while, but we’ll be back in 2021 with a bunch of new stories released week-by-week. Thanks for sticking with us, we’re excited to try something new, and we’ll see you soon.  Learn more about your ad choices. Visit megaphone.fm/adchoices