How can one can erase his finger prints?
I suppose extreme scarring of the fingertips could have that
effect, but it's hard to imagine why anyone would want to do that,
if all you have to do to avoid leaving fingerpriints is to wear
gloves. I should also point out that a person with obviously
removed fingerprints is pretty suspicious, don't you think? :} If
you mean, how can one erase latent fingerprints from an object, it
depends on how the print was made, and what the object was.
Fingerprints work like stamps; something will coat the tips of the
fingers and, when you touch something, the pattern of the
fingerprint is left behind. This can be natural oils from the body
(which are actually pretty hard to detect actually), paint, soot,
other oils such as motor oil, cooking oil, etc. How to clean the
print depends on what made the print. For instance, prints made
with paint are best removed with paint remover. Prints made with
bodily fluids like sweat or oil can be removed with a detergent.
Note that the acidic nature of sweat may mark or etch compounds
like brass or copper, so removing the fingerprint then would be a
matter of mechanically removing the etching from the metal.