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1
Putrefaction is usually caused by
imperfect
sealing
.
2
Rubber after usage becomes hard and inelastic; it may cause
imperfect
sealing
and hence decay of the fruit.
3
Spoilage is due to imperfect jars, imperfect rubbers,
imperfect
sealing
of tin cans, careless blanching, insufficient cold dipping or poor sterilizing.
imperfect
sealing
imperfect