I always thought that refrigeration was the nail in the coffin for demand for salt as a preservative, but the book mentioned in the article points out that it s

I always thought that refrigeration was the nail in the coffin for demand for salt as a preservative, but the book mentioned in the article points out that it started with canned food. I never appreciated how innovative that approach must have been at the time. Stick the food in a sealed can and then heat it up. Although, apparently Ancient Romans and Chinese had used that technique, but for some reason it lost popularity until its rediscovery in the 19th century.