How to Can Jam and Jelly, the USDA Way

Learn the safe way to make jam and jelly, and you’ll have a sweet, convenient treat for months to come!

Spoon Test
For the second test, known as the sheet or spoon test, dip a cool metal spoon into the boiling jelly mixture, and then raise the spoon about a foot above the pan (out of the steam). Turn the spoon so the liquid runs off the side. If the syrup forms two drops that hang off the spoon, as seen on the right in the picture above, your jelly is ready to be processed.  
Illustration From United States Department of Agriculture