Dry ice is the liquid frozen state of CO2. CO2 is Carbon Di-oxide and it is a totally harmless gas that dissapates very quickly in air. Normal air you breath is 70% or more CO2 gas.

CO is what is called Carbon Mon-oxide...This gas is deadly poison to humans as well. This is the gas that exhaust pipes give off. You do not ever want to use this gas for killing rats as it does not dissapate well.

Carbon di-oxide is by far the safest, fastest, most humane method of dispatch.

Of course a good wack on the table always works too, just a little too much blood to clean up.

Hope this helps, Andy

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