To help the “fingerprint detective”, the Tianda team developed a new contrast agent

Recently, the team of Professor Li Zhen and Associate Researcher Xie Yujun of the Institute of Molecular Aggregation Science of Tianjin University successfully developed a new fingerprint developer, which can realize high-quality fingerprint image development and bring new ideas for identity authentication and case investigation. The relevant results have been supported by the National Natural Science Foundation of China and Tianjin Municipality, and have been published in the authoritative journal “Advanced Materials” in the field.

At present, fingerprint recognition technology has been widely used in criminal investigation, identity recognition and other fields. “Fingerprint tertiary features” are microscopic details further extracted from fingerprint patterns, such as the width and shape of the fingerprint ridge, the distribution and spacing of sweat glands on the fingerprint ridge. In the actual criminal investigation process, many crime scenes often leave only a small number of fingerprints, and the existing fingerprint recognition technology is difficult to identify on this basis, but according to the three-level characteristics of fingerprints, it can be identified. High-quality fingerprint images are inseparable from the reliable detection of three-level fingerprint features, so the development of high-performance fingerprint visualization technology is of great significance for criminal investigation and other fields.

The working principle of the developer and the fingerprint development time Courtesy of Tianjin University

The team of Li Zhen and Xie Yujun developed a new amphiphilic fingerprint developer. The developer grinds in air to change its luminous color and can also recover on its own; The developer uses water as a solvent, which not only avoids the damage to the fine structure of the fingerprint, but also has a good development effect in various matrices. In particular, it is worth mentioning that the developer not only has a low working concentration and short development time, but also has an extremely high resolution to obtain fingerprint development images, especially for the third-level fingerprint details.

Developer develops effect on various materials, tertiary fingerprint details on tin foil and plastic Photo courtesy of Tianjin University

“This fingerprint developer can achieve the almost best effect of the current three-level fingerprint feature development,” according to the researchers, “In the future, this technology is of great significance for identity identification and fingerprint evidence collection in case scenarios.” (Source: China Science News, Jiao Defang, Wang Mingchen, Chen Bin)

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