 When the solenoid valve is closed, the CO2 vapour rapidly disperses in the air, ending the effect nearly instantaneously.This effect can be used for a variety of applications, including simulating geysers of steam, in place of pyrotechnics, or to create an instant opaque wall for a reveal or disappearance during magic acts.Dry ice (solid carbon dioxide) effects are produced by heating water to or near boiling in a suitable container (for example