2-3 g of citric or tartaric acid
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When boiled sweet is or is not added enough acid or berries themselves were not sufficiently sour, such a sweet, not long after zaharosva. Repairing it as boil in a little water and add his 2-3 g of tartaric or citric acid (a jar of 1 kg). The weight of citric acid can be changed according to the sweetness of the jam.