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Do finger prints stay heat sensitive longer depending on the surface the print is applied to?
Answer 1:

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Heat may be beneficial in some cases, such as a print on a plastic container which was subsequently softened turning into a molded fingerprint. Another example would be a latent fingerprint left on a metal. The salts in the fingerprint residue can cause corrosion if the metal is heated to a pretty high temperature.

Some additional websites that may be helpful to look over:

w iki
a little history
f actors affecting latent prints


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