Why Fruit Can Turn Dark
When Home Canning

by Jennifer Willis
(Provident Living Today)

There are five reasons why your fruit can turn dark when home canning.

  1. Fruit not processed long enough

  2. Temperature not high enough

    • Water not at rolling boil at beginning of processing

    • Water not kept at rolling boil throughout processing time

  3. Time was inaccurately counted

    • Started time before rolling boil

    • Failed to check time table

    • Failed to make adjustment for altitude

  4. Boiling water level not one inch above top of jars throughout entire processing time (fruit at top turns dark)

  5. Packing fruits that should be precooked (pears, apples, pineapples)

Reasons for Failure in Canning
Utah State University Cooperative Extension

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