Can the fingerprints on the clothes be detected?

Can't find out. Clothes are all kinds of shields made of various materials, covering the human body. Fabric is a flat and soft sheet made up of small and soft long objects crossed, wound and connected.

The surface of the fabric has considerable repulsion and adsorption performance, and the latent fingerprint is not easy to attach to the fabric, and the part attached to the fabric will be absorbed into the fabric fibers. Under the adsorption process and the dislocation of fabric fibers, the original shape characteristics of fingerprints will be destroyed. Therefore, even if fingerprints are left on the fabric, valuable fingerprint patterns cannot be obtained.

Fingers first touch grease, sweat or dust, and then touch clean surfaces, often leaving potential fingerprints. Although these fingerprints are invisible to the naked eye, they can be revealed by special methods and special chemical reagents. The so-called "looking for fingerprints on clothes" is actually looking for patterns of potential fingerprints.

Extended data:

According to the different ways of fingerprints, they can be divided into three categories:

1, patent printing, you can see the lines. Such as paint, blood, ink and other items stained by hands, are usually printed on fingerprint cards as basic information.

2. Plastic seal refers to fingerprints found on soft substances such as candles and clay by hand contact.

3. Latent print is a fingerprint pattern formed by the transfer of human natural secretions such as sweat, which is not easy to find with the naked eye and is the most common fingerprint at the crime scene.

Fingers first touch grease, sweat or dust, and then touch clean surfaces, often leaving potential fingerprints. Although these fingerprints are invisible to the naked eye, they can be revealed by special methods and special chemical reagents.

Fingerprint observation method:

1. Breathing observation method: Breathing observation is performed on the surface of a smooth object.

2, naked eye observation method: with the help of certain light, angle observation. With the help of backlight, fingerprints can often be displayed. This is because fingerprints are often stained with dust, which absorbs light and has a dark color.

3. Magnifier observation method: observe under a certain light and angle with the help of a magnifying glass.

4. Ultraviolet observation method: observation with the help of ultraviolet characteristics.

5. Rational and chemical observation method: It is necessary to use rational and chemical processing methods to find and find potential fingerprints that are difficult to be observed by naked eyes.

6. Cyanogel method: firstly, prepare a solution of cyanogel and ether, immerse the filter paper with a proper size in the solution, take it out and dry it, and then contact the filter paper with the fingerprint for 5-60 minutes. The part of the fingerprint near the paper is volatilized by glue, and the figure appears on the surface of the filter paper.

7. Powder method: choose powder with large color contrast, break it up and extract a complete fingerprint.

8, magnetic powder method, using fine iron powder particles, using magnets as brushes, brushing back and forth, showing fingerprints.

9. Laser method. With the development of laser technology, China uses laser to display fingerprints. The display device adopts argon ion laser.

Laser can show fingerprints, because there is always a layer of sweat and fatty acid on the surface of people's fingers, leaving inconspicuous fingerprints after touching objects; Use laser, sweat, fatty acids, etc. There will be color fluorescence and clear fingerprints. Take a clear fingerprint photo with a special fingerprint camera. After the photo is enlarged, it brings a lot of convenience to the appraisal work.

Baidu Encyclopedia-Fingerprints (lines on people's fingers)