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Sooooo... any clues as to where to start looking? Ended up on Dynamo's website the other night and he performs this, the bottom of the bottle falls off in the spectators hands. Unfortunately when scouring the interweb for such an effect to purchase, I just get swamped by people desperate to share the "trick" of bursting the bottom of a bottle off with the air pressure from a swift knock to the neck of the bottle etc.

Any ideas on what I'm looking for... chemicals? Mechanical gimmicks? Real magic?!

this interested me - ill keep my eyes peeled.

I have seen something in the past that does glasses, it may work for bottles.

I will have a quick hunt for you

I believe it is called "The Devils Cola Bottle" but I have no idea where to purchase it from. If I remember rightly, it is quite pricey, around the $1,000 mark

I was talking to Dynamo about this effect last time I saw him. Its not a gimmick, but you do need a very high temperature before, if you get what I mean...

A very similar technique is used by crafters to create 'wine glasses' and 'beer glasses' from wine and beer bottles.

To get the perfect fracture, a tray of oil is prepared. The bottle/glass item is placed in the oil—the depth of the oil dictates the 'fracture' line. A red hot poker is plunged into the oil tray, and the surface of the oil heats rapidly, causing a stress fracture.

This *could* be the weakening technique used.

Hi

Not sure if it'll do what you want but i saw this a while ago.

Mental Hammer by Anton Coradin

Demo video and product here:

http://www.magicproshop.com/mental-hamm ... -6528.html

Hope this helps,

Jason

I have a trick that makes light bulbs explode, not sure if it would work with bottles though.

here is a video of the trick!
http://www.youtube.com/watch?v=klh4cBdDL3U&mode=related&search=

Schwen is correct... It's the "Devil's Bottle"

You can get it on Hank Lee's site - but it costs about $1,000 or there abouts?

Cheers guys. Looks like one of those "I'll never be able to afford it" things. How disappointing.

Basically the effect is a simple Science trick, although if you buy the marketed version I think it tells you how to convert regular coke bottles into the prop, you can research the topic if you google "bologna bottles" basically they are bottles tough as houses on the outside and as brittle as hell on the inside, so anything sharp inside will cause the bottle to shatter!

You can make them if you know how, ( I dont) I think its something to do with heating and cooling the outside different to the inside etc!

I did not know that someone had patented the Bologna Bottle technique. I did not know that you could patent such things.

A Bologna Bottle is one which has been cooled very rapidly on the inside and very slowly on the outside (or vice-versa, I can't remember. Either way the principle is still the same). This maximises the internal stress in the glass to the point where a slight increase in the stress can cause the bottle to fail catastophically.
A scratch on the inside will cause stress concentrations and can push the bottle 'over the edge', as it were.
If the bottle is prepared right then even a small scratch can cause this failure. It can even be as little as a hard object hitting the inside gently.
This principle is familiar to anyone who's ever eaten one of those big bars of chocolate with the gaps between the squares, so that you can break them up.
It is not "brittle" however. A bottle can still be hard enough on the outside to hammer a nail into wood.
Very fun to watch, very effective engineering experiment.

Yes, I did get ultimately find Bologna bottles were the principle for this trick. Infact, you can hear the tiny sharp "breaker" rattling round in some of the demo videos as they shake the bottle. I get the impression though that without a kiln or an industrial blow-torch or various other expensive tools it would be a bu**er to make. If anyone knows otherwise, let me know! Unfortunately, the set-up means that you would never really be able to perform it in bars or clubs, where it would be most effective anyway. Imagine paying £500 for a bottle only to have it confiscated by a bouncer at the door...!

Here's a poor man's solution: chuck lump of dry ice into the bottle speedy-quick, hand it to the spec and explode the bottle with your "mind".

I got taught this by a Gypsy Traveller (how many of you have wanted to use that line before lol) But seriously You take any bottle and tap the top and the bottom will fall out perfectly........

If your interested PM my sorry ass for my details on how I do it...........