Raw materials used in food preservation. Although the production methods and materials are similar. For example, to make a fermented fish and smoked fish, whether it is 100 years before or now when it used the same raw materials as salt. The other complements, it is natural to find, but there is still a difference is now adding color and invent more food preservation, there are a variety of important needs and to increase the quality of food, more than 100 years ago.