A Safer Way to Keep Greens Fresh with Carbon Dioxide
Intrigued by this question, we came up with a “time-release” version of this method that would slightly delay gas production until we placed the “generator” in the bag of greens, preserving the maximum amount of CO2: Freeze 1 teaspoon of white vinegar in a 2- to 4-ounce container (such as a spice bottle) and then sprinkle 1 teaspoon of baking soda over the vinegar’s surface. Next, cut a small, three-layer-thick square of paper towels and secure it over the container’s opening with a rubber band. Place the container in a zipper-lock bag full of salad greens and seal it immediately. As the acidic vinegar melts, it combines with the alkaline baking soda to produce carbon dioxide. The paper towels let the gas seep into the bag while preventing any melting vinegar from leaking out.
We admit that it’s a little wacky, but this far more sanitary method works just as well as blowing into the bag, extending the life of the greens by up to five days (as long as the bag is kept sealed).