TABLE FOR CANNING FRUITS BY ONE PERIOD OF PROCESSING [Footnote 124:
Adapted from Farmers' Bulletin 1211, "Home Canning of Fruits and
Vegetables," Revised August, 1922.]
TIME OF PROCESSING IN PINT OR
FOOD TIME OF QUART JARS IN:
BLANCHING (a) (b)
Water Bath at Pressure
12 degrees F. or Steam Cooker 5 Pounds
Cooker
Minutes Minutes Minutes
Apples,
cut in pieces 1 1/2 20 to 30
Apricots 1 to 2 30 10
Blackberries,
Blueberries None 10 to 20 10
Cherries 1/4 25 10
Currants,
Dewberries,
Gooseberries None 10 to 20 10
Pears 4-8 in boiling sirup 20 to 30 10
[Footnote 125: Do not cold dip after blanching in boiling sirup.
Use the longer time of processing in the water bath for large
pears.]
Peaches 1 or until skin
is loosened 20 to 30 10
Plums None 20 to 30 12
Pineapples None 30 10
Raspberries None 10 to 20 10
Rhubarb None 20 to 30 10 to 15
Strawberries None 10 to 20 10
NOTE.—Use only fresh, sound fruits for canning.
Do not begin to count the time of processing in a water bath until the water reaches the boiling point.
When different times of processing are given, as 20 to 30 minutes, use the longer time for quart glass jars and the shorter for tin cans.
For altitudes higher than 1000 feet, increase the time of processing 10 per cent for each additional 1000 feet. For very high altitudes it may be best to use a pressure cooker for certain fruits.
If fruits are packed tightly, time of processing should be increased.
DISCUSSION OF THE DIFFERENT DEVICES USED IN THE COLD PACK PROCESS.—(1) The kettle or wash boiler provided with a rack is an inexpensive device. It is satisfactory for processing fruits and acid vegetables; there is a question whether non-acid vegetables may be processed in the hot water bath even though they are processed on three successive days. It is thought by some that the flavor of foods canned at low temperature, i.e. not above 212 degrees F., is superior to that canned at a higher temperature.
(2) The steam cooker is a convenient and satisfactory equipment to use for canning fruits and some vegetables. It is more expensive, however, than the kettle having a rack, but less fuel is required when using it.