Don’t Make These
Canning Mistakes
 There are a number of
mistakes that can be made when preserving food. 
Make sure not to make the following mistakes.
 There are a number of
mistakes that can be made when preserving food. 
Make sure not to make the following mistakes.  
·        
Make up your own canning recipe. Without scientific
testing, you will not know how long the product needs to be processed to be
safe. 
·        
Adding EXTRA starch, flour or other thickener to
recipe. This will slow the rate of heat penetration
into the product and can result in undercooking. 
·        
Adding EXTRA onions, chilies, bell peppers, or
other vegetables to salsas. The extra vegetables dilute the acidity and can
result in botulism poisoning. 
·        
Using an oven instead of water bath for
processing. The product will be under-processed since air is
not as good a conductor of heat as water or steam.
·        
Not venting pressure canner. Lack of venting can
result in air pockets (cold spots) which will not reach as high a temperature
as is needed.
·        
Using an oven instead of a water bath canner for
processing.  The product will be under
processed since air is not as good of conductor as heat.
·        
Cooling
pressure canner under running water. 
·        
Calculations as to processing time include the residual heat during the normal cool-down period
as part of the canning process. Hurrying this process will result in
under-processed food; siphoning of liquid from the jars and jar breakage may
also occur.
·        
Use of mayonnaise jars. The thinner walls of the
glass may break, especially if used in a pressure canner, and it may be more difficult to obtain a good seal.
·        
Acid needs to be added when canning tomato
products.  One tablespoon of lemon juice
needs to be added to pints jars and two tablespoons per quart jar.  
Source: Kelly Riggs, Utah
State Extension