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Home > Cooking School > Cooking Techniques > Jam Making > Frequently Asked Questions 5
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Choosing Fruit
Preparing Fruit
No-Cook vs. Cooked Jam
Role of Pectin & Acid
Role of Sugar
Sterilizing Techniques
Jam Jelly Preserve Glossary
Frequently Asked Questions

Summer Centre

What To Do If Your Jam Does Not Set?

If you purchased Certo Liquid
If you purchased Certo Crystals
If you purchased Certo Light Crystals 

If you purchased Certo Liquid…

What To Do If Your Cooked Jam Doesn't Set

Use These Directions If You:   

  • followed incorrect procedures

  • used the wrong kind of Certo

  • forgot to add the Certo or lemon juice  

  • reduced the amount of sugar or fruit

Remaking Cooked Jam

PLACE one batch of prepared jam in saucepan. Add omitted or reduced amount of fruit, sugar or lemon juice. Bring to boil on high heat. Add amount of Certo initially called for in recipe. Bring to full rolling boil; cook just 30 sec. Remove from heat. Stir and skim for 5 min. to prevent floating fruit. Re-bottle in re-sterilized jars with new centres.

What To Do If Your No-Cook (Freezer) Jam Doesn't Set

Use These Directions If You:   

  • used the wrong kind of Certo

  • forgot to add the Certo or lemon juice

  • reduced the amount of sugar or fruit 

Remaking No-Cook (Freezer) Jam

PLACE one batch of prepared jam in large bowl. Add missing sugar, fruit, lemon juice or Certo. Stir 3 min. Pour jam into clean containers. Cover and let stand at room temperature or in refrigerator up to 24 hours or until set. Freeze as directed.

If you purchased Certo Crystals…

What To Do If Your Cooked Jam Doesn't Set

Use These Directions If You:   

  • used the wrong kind of Certo

  • followed incorrect procedures

  • reduced the sugar or fruit volumes  

Remaking Cooked Jam

STIR one box Certo Crystals into 3/4 cup water in small saucepan. Bring to full rolling boil on medium heat; continue boiling 1 min., stirring constantly. Remove from heat; set aside.

PLACE one batch of prepared jam in separate saucepan. Add missing fruit or sugar, if reduced. Bring to full rolling boil on high heat, stirring constantly. Add dissolved pectin. Return to boil; cook just 30 sec. Remove from heat. Stir and skim for 5 min. to prevent floating fruit. Re-bottle in re-sterilized jars with new centres.

What To Do If Your No-Cook (Freezer) Jam Doesn't Set

Remaking No-Cook (Freezer) Jam

PLACE one batch of prepared jam in large bowl. Add missing fruit or sugar, if reduced, or if Certo has been omitted. Stir 3 min. Pour jam into clean containers. Cover and let stand at room temperature or in refrigerator for up to 24 hours or until set. Freeze as directed.

If you purchased Certo Light Crystals…

What To Do If Your Cooked Jam Doesn't Set

Use These Directions If You:   

  • used the wrong kind of Certo

  • followed incorrect procedures

  • reduced the sugar or fruit volumes     

Remaking Cooked Jam

STIR one box Certo Light Crystals into 1-1/2 cups water in small saucepan. Bring to full rolling boil on medium heat; continue boiling 1 min., stirring constantly. Remove from heat; set aside.

PLACE one batch of prepared jam in separate saucepan. Add missing fruit or sugar, if reduced. Bring to full rolling boil on high heat, stirring constantly. Add dissolved pectin. Return to boil; cook just 30 sec. Remove from heat. Stir and skim for 5 min. to prevent floating fruit. Re-bottle in re-sterilized jars with new centres.

What To Do If Your No-Cook (Freezer) Jam Doesn't Set

Remaking No-Cook (Freezer) Jam

PLACE one batch of prepared jam in large bowl. Add missing fruit or sugar, if reduced, or if Certo has been omitted. Stir 3 min. Pour jam into clean containers. Cover and let stand at room temperature or in refrigerator up to 24 hours or until set. Freeze as directed.  

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