Soup stock, like many other foods, spoils quite
readily. Therefore, in order to keep it for at least a few days, it must
receive proper attention. At all times, the vessel containing stock
should be tightly closed and, especially in warm weather, the stock
should be kept as cold as possible. Stock that is heavy enough to
solidify into a jellylike consistency when it is cold will keep better
than stock that remains liquid. The addition of salt or any spicy
flavoring also helps to keep stock from deteriorating, because these
materials act as preservatives and prevent the action of bacteria that
cause spoiling. Bacteria may be kept from entering soup if, instead of
removing the grease, it is allowed to form in a solid cake over the
top. No matter which of these precautions is taken to prevent stock from
spoiling, it should be heated to boiling point once a day when it is to
be kept for several days.
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