Many people think that the ice cubes in those fast food restaurants are transparent because we use cold boiled water ice at home, and they use pure water. It is undeniable that the water they use is pure water, but this is not the real reason for making the ice cubes transparent. The main reason is that their refrigerator is different from the equipment we use for refrigeration. If we look closely, we can find that the frozen ice in our house is not completely opaque, but the four corners are transparent, but the middle piece is white and opaque. In fact, this white material is formed after being squeezed in the freezing process. Although we often say that heat expands and cold contracts, when water freezes, its volume will increase. In the process of freezing, the surrounding water usually freezes first, and the ice-making process of fast food restaurant equipment is different from our own ice-making process at home.

The places for making ice in their equipment are vertically distributed, not horizontally distributed as we put them in the refrigerator. Secondly, the way they add water is also quite special. It is in the form of water injection. When water is injected into the ice cube, some water will be frozen into ice in the process. At this time, water that has not frozen into ice will flow down. In this cycle, the ice in the ice compartment is frozen layer by layer, thus avoiding the squeezing phenomenon when freezing ice in our daily life, and naturally there is no white color, which is very transparent and beautiful. It is different from the water used by KFC when we make ice at home.

When we make ice at home, we use ordinary tap water. However, KFC uses filtered mineral water and special machines to make ice, so the ice cubes made are naturally transparent. Of course, although the colors are different, the taste is the same. It doesn't make any difference, but the color is better. But when we make ice cubes at home, we can actually use mineral water, which is more hygienic to drink. The water used by KFC to make ice cubes is not boiled directly with tap water at home, but water without impurities, such as purified water or filtered mineral water and distilled water.

There is a process in the production process. Boil the water first, then cool it to boil, and then cool it. Then, it can be made in an ice cube maker and then frozen in a refrigerator to make this transparent ice cube. However, the taste of transparent ice cubes is similar to that of our frozen ice cubes. There is basically no difference, but the face value is really high and there is no need to entangle it at all. If you want to make ice cubes at home, you'd better choose mineral water or pure water, which is more hygienic and healthy.