Method for developing latent fingerprints through multi-metal deposition technology
A latent fingerprint and multi-metal technology, which is applied in the field of fingerprint identification, can solve the problems of complex and cumbersome operation steps, poor repeatability of display effect, and limitation of practical application, and achieve the effects of improving sensitivity, displaying quickly, and increasing application value
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Embodiment 1
[0036] Take the latent fingerprint of an object with a common double-sided adhesive as an example, the specific operation has the following steps:
[0037] 1) Using silver nitrate, ethanol and ultrapure water as raw materials, configure silver nitrate activation solution; weigh 20.00mg silver nitrate with an analytical balance, place it in a 10ml centrifuge tube, add 8.5ml ethanol and 1.5ml ultrapure water to the mark , Mix well and set aside.
[0038] 2) Prepare a copper plating solution with a copper ion concentration of about 0.15mol / L: weigh 2.028g copper sulfate pentahydrate, 6.1125g potassium sodium tartrate, and 2.4375g sodium hydroxide, and place them in a 50mL volumetric flask; glyoxal (40 %); When fingerprints are revealed, mix the two solutions in a volume ratio of 4:1.
[0039] 3) Add a few drops of silver nitrate activation solution to the surface of the latent fingerprint test material, react for 5 minutes at room temperature, and dry the remaining activation solution ...
Embodiment 2
[0043] Take the latent fingerprint of an object on a common transparent adhesive surface as an example, the specific operation has the following steps:
[0044] 1) Using silver nitrate, ethanol, and ultrapure water as raw materials, configure silver nitrate activation solution; weigh 31.00mg silver nitrate with an analytical balance, place it in a 10ml centrifuge tube, add 8.5ml ethanol and 1.5ml ultrapure water to the mark , Mix well and set aside.
[0045] 2) Prepare a copper plating solution with a copper ion concentration of about 0.15mol / L, weigh 2.028g copper sulfate pentahydrate, 6.1125g potassium sodium tartrate, and 2.4375g sodium hydroxide, and place them in a 50ml volumetric flask; glyoxal (40 %); When fingerprints are revealed, mix the two solutions in a volume ratio of 4:1.
[0046] 3) Add a few drops of silver nitrate activation solution to the surface of the latent fingerprint sample, and react for 15 minutes at room temperature. Dry the remaining activation solution...
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