Preserving Food:
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Using Boiling Water Canners
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Elizabeth L. Andress, Ph.D.
Associate Professor and Extension Food Safety Specialist,
Department of Food and Nutrition
Document Use:
Most
boiling water canners are made of aluminum or porcelain-covered steel.
They have fitted lids and removable racks that are either perforated or
shaped wire racks. The canner must be deep enough so that at least one
inch of briskly boiling water will be over the tops of jars during
processing. Some boiling water canners do not have completely flat
bottoms. A flat bottom must be used on an electric range. Either a flat
or ridged bottom may be used on a gas burner. To ensure uniform
processing of all jars with an electric range, the canner should be no
more than 4 inches wider in diameter than the element on which it is
heated. (When centered on the burner or element, the canner should not
be more than 2 inches wider on any side.)
Follow these steps for successful boiling water canning:
(Read through all the instructions before beginning.)
- Before you start preparing your food, fill the canner half full
with clean warm water.
- Center the canner over the burner and preheat the water to 140
degrees F. for raw-packed foods and to 180 degrees F. for hot-packed
foods. You can begin preparing food for your jars while this water
is preheating.
- Load filled jars, fitted with lids, into the canner one at a time,
using a jar lifter. When moving jars with a jar lifter, make sure
the jar lifter is securely positioned below the neck of the jar
(below the screw band of the lid). Keep the jar upright at all
times. Tilting the jar could cause food to spill into the sealing
area of the lid.
If you have a shaped wire rack that has handles to hold it on the
canner sides, above the water in the canner, you can load jars onto
the rack in the raised position and then use the handles to lower
the rack with jars into the water.
- Add more boiling water, if needed, so the water level is at least
one inch above the jar tops. For process times over 30 minutes, the
water level should be 2 inches above the jars.
- Turn the heat setting to its highest position, cover the canner
with its lid and heat until the water boils vigorously.
- Set a timer (after the water is boiling) for the total minutes
required for processing the food.
- Keep the canner covered for the process time. The heat setting may
be lowered as long as a gentle but complete boil is maintained for
the entire process time.
- Add more boiling water during the process, if needed, to keep the
water level above the jar tops.
- If the water stops boiling at any time during the process, turn
the heat on its highest setting, bring the water back to a vigorous
boil, and begin the timing of the process over, from the beginning
(using the total original process time).
- When the jars have been processed in boiling water for the
recommended time, turn off the heat and remove the canner lid.
- Using a jar lifter, remove the jars one at a time, being careful
not to tilt the jars. Carefully place them directly onto a towel or
cake cooling rack, leaving at least one inch of space between the
jars during cooling. Avoid placing the jars on a cold surface or in
a cold draft.
- Let the jars sit undisturbed while they cool, from 12 to 24 hours.
Do not tighten ring bands on the lids or push down on the center of
the flat metal lid until the jar is completely cooled.
- Remove ring bands from sealed jars. Put any unsealed jars in the
refrigerator and use first.
- Wash jars and lids to remove all residues.
- Label jars and store in a cool, dry place out of direct light.
Document
use:
Permission is granted to reproduce these materials in
whole or in part for educational purposes only (not for profit beyond
the cost of reproduction) provided that the author and the University
of Georgia receive acknowledgement and the notice is included:
Reprinted with permission from the University of Georgia.
Andress, E. (1999). Preserving Food: Using Boiling Water Canners.
Athens, GA: University of Georgia, Cooperative Extension Service.
Content Person Contact: Elizabeth L. Andress, Ph.D. eandress@uga.edu
Copyright Permission: (706) 542-4860
Document Review:
Document Size:
Publication Date: 1999-01-01
Entry Date: 1999-01-28
Pull Date:
Pub #: FDNS-E-37-2
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