manufacture of Cheddar cheese
Question: The magic salt

Calcium chloride as a food additive : 
Calcium chloride prevents spoilage of food and is popularly used as a
 preservative in packed foods. It also helps to keep the food healthy and fresh for a longer duration. The use of calcium chloride as a food additive and preservative has one more advantage. It helps to increase calcium content in the food, thereby contributing to boost nutritional value of the food item