This article is from the Food Preserving FAQ, by Eric Decker firstname.lastname@example.org with numerous contributions by others.
Crumple up a square of wax paper, add the wax paper ball to the top of jars
of pickled peppers, canned cherries, etc. to keep the food down in the brine.
Seal with two piece lids, can process with wax paper ball in waterbath.