I came across the advice from people 'in the know' - the makers of Bell and Kerr brand canning equipment.
There are several factors that may cause a soft pickle:
- * using a vinegar with an acidity level that is less than 5%;
- * pickles were not processed or not processed long enough in a boiling-water canner to destroy spoilage microorganisms;
- * variety of cucumber used;
- * brine was too weak when fermenting cucumbers;
- * cucumbers were not completely covered with brine while fermenting;
- * cucumbers were not completely covered with liquid when packed in the jar;
- * scum was not removed from top of brine while fermenting;
- * improper storage or handling of cucumbers before pickling.
