Dry ice displaces oxygen in a container. Therefore, it is specially used to preserve food grains and related products. Another advantage of using dry ice is that it does not hamper the quality or taste of the preserved material. It prevents insects and microbe activities. Hence, it is also used to preserve biological materials in labs.

To use the dry ice for the best effect, wrap the dry ice in a few layers of newspaper and place it on top of the food. You can place regular ice below. The dry ice will last longer if you don't let it come in contact with any water.