Aqueous solution of citric acid for acidification and preservation of food products and beverages, as decalcifying agent for removing different types of scale and milk stone, for use as tanning agent, for use in the manufacture of cleaning products and detergents, and for use in the food and beverage, cosmetics and toiletry, pharmaceuticals, construction, and materials treatment, plastics, textile, tobacco, agricultural, paper, photographic, fire safety, oil well treatment and water treatment...