1925, the United States established a dry ice production joint-stock company. At that time, the finished product was called dry ice, and later it was known as "dry ice", but its official name was solid carbon dioxide.

Dry ice is not something as simple as a cloud, nor is it "smoke", because carbon dioxide is invisible, so it is not smoke, but water mist. Carbon dioxide changes from solid to gas to absorb a lot of heat, which makes the temperature of the surrounding air drop rapidly, and the air temperature drops, and the steam liquefies, releasing heat and turning into small water droplets, only fog.

Dry ice spraying is widely used to cover the atmosphere on the stage. Its principle is that dry ice is sprayed on the stage to reduce the air temperature, dry ice sublimates to reduce the air temperature, and cold air steam burns into small water droplets suspended in the air to form white fog.

Dry ice is a solid carbon dioxide content, usually a colorless gas, which naturally exists in the air. Although the content of carbon dioxide in the air is relatively low (about 0.03% by volume), it is recognized as one of the most important gases.

Good dry ice effect is close to the stage, which has several main characteristics of modern stage smoke screen machine, such as rapid development, large capacity, large smoke storage capacity, distance of 10 meter, hundreds of square meters of fabric smoke area, unique design, dry burning prevention, automatic thermal control, real-time temperature digital display and other characteristics, low noise, compact structure, convenient use and long spraying distance.

The effect of high-quality dry ice CO2 smoke screen on Dalian stage has the characteristics of low temperature, constancy, excessive white smoke, no disorder and no residue, long on-site stay time and no floating surface.

On the stage, smoke is a kind of solid carbon dioxide called dry ice, which does not burn and evaporate directly, so we see that gas is not smoke. Carbon dioxide is invisible. Carbon dioxide changes from a solid to a gas to absorb a lot of heat, which makes the temperature of the surrounding air drop very quickly. It dissolves less, and the steam condenses, so the surrounding steam becomes a drop, that is, a fog. It is heavier than air.