1. Preservation
    Broadly preservation can be divided into 3 groups, namely:
       a.  
Preservation NATURALLY

        
Natural preservation process involves heating and cooling.

       b. 
Preservation IN BIOLOGICAL

        
Preservation of biological processes such as by fermentation (fermentation). Fermentation (fermentation) is a process of change carbohydrates into alcohol. Substances that are working on this process is an enzyme produced by yeast cells. The length of fermentation processes dep...

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