the jars are not full when they are ready to be sealed. This is
illustrated in Fig. 17. Such shrinkage is usually the result of
insufficient blanching, or poor packing or both. However, it will not
prevent the food from keeping perfectly. Therefore, the covers of such
jars of food must not be removed and the jars refilled; rather, seal the
jars tight immediately, just as if the food entirely filled them. If, in
sealing jars removed from the water bath, it is found that a rubber has
worked loose, shove it back carefully with the point of a clean knife,
but do not remove the cover.

[Illustration: FIG. 15]

As the jars are sealed, place them on their sides or stand them upside
down, as in Fig. 18, to test for leaks, in a place where a draft will
not strike them and cause them to break. If a leak is found in any jar,
a new rubber and cover must be provided and the food then reprocessed
for a few minutes. This may seem to be a great inconvenience, but it is
the only way in which to be certain that the food will not be wasted
by spoiling.

[Illustration: FIG. 17]

[Illustration: FIG. 18]

[Illustration: FIG. 19]

41. WRAPPING AND LABELING.--When the jars of food have stood long
enough to cool, usually overnight, they are ready for wrapping and
labeling. Wrapping is advisable for practically all foods that are
canned, so as to prevent bleaching, and, of course, labeling is