One jar out of the batch of jelly I made did not gel. The other jars gelled perfectly. What could be wrong with this one jar?
A good possibility is that the last scrapings from the sides of the jelly-making pan were used to fill one last jar of jelly. These scrapings probably did not contain an even distribution of pectin and, therefore, the jelly did not "set up". To prevent this problem, it is a good idea to stir the jelly in the pan frequently while filling the jars to insure an even pectin distribution. Also, restrain yourself from scraping the sides of the pan too diligently to fill "just one more jar".
Last update: Tuesday, May 05, 2009