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Anne Marie Helmenstine, Ph.D.

Anne Marie's Chemistry Blog

By Anne Marie Helmenstine, Ph.D., About.com Guide to Chemistry

Countdown to Halloween - Spooky Halloween Fog Effects

Friday October 30, 2009
Dry Ice Fog (Shawn Henning)Fog increases the spookiness factor of any Halloween display. There are a few different ways to create creepy Halloween fog.

Dry ice fog is nice because it's non-toxic, doesn't have a weird chemical smell, and billows out tons of fog that naturally sinks to the floor.

Liquid nitrogen fog is nice because nothing extra is needed to produce fog. Liquid nitrogen works by evaporating and by cooling the air, causing water to condense into real fog. Nitrogen is the primary component of air and is non-toxic.

Atomized glycols are used to make Halloween smoke or fog. This is the 'fog juice' that you find for commercial fog machines. The big advantage to this type of fog is that you can store the chemical for use at any time (you need to get dry ice or liquid nitrogen close to the time you'll be using it).

Water vapor fog is any easy type of fog to make. Basically it involves making or using a fogger. This fog rises rather than sinks, so it produces a different effect from the other types of fog.

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