Never

You can build this where it's safe and away from children or, the like minded.

I did.
It disappeared-ed.

Get some dry ice.
put it in a one gallon can on legs for heat to blow under from a mini heater fan!

Direct the vaporized gases from the ice from the top through a piping of volume via fan driven engulfing level of- an expensive or learn by graduation of car coils on how to maintain a plasma field.

Always make sure you have fire extinguishers, read and know the safety operation of all the tools you use!

Start with your basic coil from an early model car/truck and a couple 12 volt batteries.

Design a pod for the coil to lay on it's side.
Engineer the positive to the TOP and visa versa.
Wrap the coil in foil (not the redesigned poles. They're insulated, you know, to the 1 and a half inch tower openings!), I'm going to repeat. Start from the beginning.

If you can't picture it, DON'T DO IT!

Now in a place away from civilize-fucking-zation!

Feel free to endanger your lives!

Allow the heater fan to blow slightly warm to hot under the one gallon can with the dry ice being propelled through a tube that flows the ice-gas over the coil at the rate of a jerry rigged acceleration of voltage to the highly deadly and illegally achieved voltage to the proper poles north, being TOP and South being BOTTOM of the coil laying on it's side with the poles being an 1 inch and half or more, never the less. Hehe.

If you achieve the correct timing of when the coating is sufficient to voltage increase to fog-plasma envelopment in ratio to complete coverage. You can achieve the impossible.

Mine disappeared, and, I haven't hide nor hair of it! Had it not been for video-ing it. Fore back up!

But, you get the math correct?

Oh, never ever touch it until you discharge it by touching the negative to the ground via ground wire when done.