Michigan State University Extension
Preserving Food Safely - 01600943


     *  While preparing a canner load of jars, keep peeled, 
        halved, quartered, sliced  or  diced apples, apri-  
        cots, nectarines, peaches  and pears in a solution  
        of 3 grams (3000 milligrams) ascorbic acid to 1     
        gallon of cold water.  This procedure is also useful
        in maintaining the natural color of mushrooms and   
        potatoes, and for preventing stem-end discoloration 
        in cherries and grapes. You can get ascorbic acid   
        in several forms:                                   

              Pure Powdered Form--seasonally available      
              among canners' supplies in supermarkets.  One 
              level teaspoon of pure powder weighs about 3  
              grams.  Use 1 teaspoon per gallon of water as 
              a treatment solution.                         

              Vitamin C Tablets--economical and available   
              year-round in many stores.  Buy 500-milligram 
              tablets; crush and dissolve six tablets per   
              gallon of water as a treatment solution.      

              Commercially Prepared Mixes of Ascorbic and   
              Citric Acid--seasonally available among       
              canners' supplies in supermarkets.  Sometimes 
              citric acid powder is sold in supermarkets,   
              but it is less effective in controlling       
              discoloration.  If you choose to use these    
              products, follow the manufacturer's           

     *  Fill hot foods into jars and adjust headspace as    
        specified in recipes.                               
     *  Tighten screw bands securely, but if you are        
        especially strong, not as tightly as possible.      
     *  Process and cool jars.                              
     *  Store the jars in a relatively cool, dark, dry      
        place, preferably between 50 and 70 degrees         
     *  Can no more food than you will use within a year.   

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