Before storing chutneys, here are a few tips and tricks to try.
Toss the jars in boiling water:
Fill a big container partly with water and bring it to a boil.
It will take about 5-6 minutes. When the water has reached a boil, carefully remove your clean glass jars from the boiling water
and place them in the vessel filled with warm water. Allow the jars to sit in the vessel for 3-5 minutes.