[BnPMagic]

HI, Im a magician look for a method to do with an effect. I have watched Card Shark on Nationgrafic channel, in the last effect, there was a crytal clear liquid  claim by the performer is H2SO4 90%. and he show the power of the liquid by pouring it on to the Sponge, the Sponge melt away a smoke come up. Now, i know that liquid is not H2SO4 because he put it on his face and shirt but nothing happen. so what is the liquid chemical can react to Polyurethane Sponge but not react to Skin and shirt?? can any expert helping me? When The Sponge melt it come a smoke and have the brown colour.

[billnotgatez]

First of all anything a magician says or does is done for misdirection and not necessarily true.
So the sponge may not be what it is said to be made of or is swapped
The sulfuric acid is swapped to something else between pouring and being put on skin
The sulfuric acid is not sulfuric acid
and I could go on and on and on

I even question someone handling 90% acid - if it even can exits
(maybe someone else can address this)
EDIT mass fraction 98% is concentrated

If it were my guess they are pouring something that is not acid onto something that is not Polyurethane Sponge.
Or, it is all misdirection (the smoke and mirrors thing).

[BnPMagic]

As you can see in the clip, there is no swaping, no changing. if u look closely the first cup when the fighter poring in to Magician face is the "acid" cup. So the only thing i can think of is that not normal water, it have to be some kind of Liquid. can u suggest any other liquid that i can perform like this? not need to be Sponge, anything that similer, can disolve thing but oke to take it on the face. thanks alonhttp://www.youtube.com/watch?v=ZnhGlaPC3b8&feature=youtu.be

[opsomath]

That is not concentrated sulfuric acid. I'd say it is water as well. Conc H2SO4 is much more viscous and telling it apart from water would actually be quite easy.

The liquid at 1:48 looks different from the liquid at 2:40. My guess is that he switched the bottles at some point with sleight of hand.

The other possibility is that the sponge is pretreated with acid and that the reaction doesn't start until water is added. In other demonstrations of this reaction, it specifies that you must have a "wet" sponge. Perhaps there's already acid in the bucket and he's just pouring water on the sponge?

http://www.youtube.com/watch?v=F5jfRjzXLbE

(I hope that is it, because it'd be a cool scientific demo rather than just sleight of hand. But I think the swap is the most likely thing.)

[BnPMagic]

Thanks alot everyone, i think i will try out something.