What kind of acid is used to recover a VIN number that has been altered?

Question:
Police can put an acid on metal to recover an original VIN number that has been stamped into a motorcycle frame or engine case after it has been altered or removed. Anybodyknow what kind of acid they use?

Answers:

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It's a wide variety of acids and acid compounds.
Magnaflux and heat is also used.
Depends on the type of material being tested.

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It's a PROCESS,,a PROCEDURE,,,not just a matter of pouring acid on a surface.

I need an atv EXPERT to answer this, not some cocky guy with a honda sayin i think its better?


Cupric Chloride,Nitric,Hydrochloric,
Hydroflouric,Phosphoric,
Aqua Regia,Ferric Chloride,
Sodium Hydroxide,,,etc,etc are some of the chemical involved.

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never heard of that one before, I do not see how it could recover a VIN if completly grinded off

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purple haze...or orange barrel... call the cops or the local collage chemistry dept.i know it is done all the time by the ATF.[ on guns]

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Here is an article on this subject. It doesn't specifically give the type of acid used however.

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http://lucy.mrs.org/2006brazil/wedpix/j5...
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