When making jam, there is no corresponding sterilization equipment for sterilization, including the cleaning of raw materials, and it cannot be guaranteed that no miscellaneous bacteria will be brought in. If it is left for too long, various microorganisms will grow at the same time during fermentation. In addition to yeast fermentation, pathogenic bacteria may also grow and reproduce together.
Don't leave homemade jam in the refrigerator for too long. If you make too much jam, you can pack it and put it in the refrigerator for temporary storage. It is recommended to finish it in two days.