This preservative is used by some manufacturers to keep the product longer. According to medical experts from India, it is a highly toxic preservative. This fact was proven by laboratory tests that were conducted to determine the quality of products.
Experts have identified traces of formalin in some varieties of dried fish. In large amounts, it can affect health.
Of course, not all manufacturers use dangerous chemicals in the production. But in any case, consumers must know what they buy and look after their health carefully.