New forensic method can prove link between explosive attacks

The Netherlands Forensic Institute (NFI) said Friday it has developed a new forensic method that can help link suspects to explosions involving firework bombs. It does so by detecting traces of flash powder on skin or clothing. These traces can then be connected to actions such as building or transporting explosives.

The institute said the technique focuses on residues from flash powder. Flash powder is commonly used in illegal fireworks such as the Cobra 6. A key measurable component of flash powder is perchlorate. This substance can be detected through forensic analysis.

The announcement comes as the Netherlands experiences an average of 29 explosions or attempted explosions per week. Many of these incidents involve improvised devices made with illegal fireworks materials.

Forensic researcher Irene van Damme completed a doctoral study on this topic at the University of Amsterdam (UvA). She collected samples from hands and various objects. She did this before and after New Year’s celebrations.

According to the NFI, her findings showed a consistent pattern. The presence of perchlorate on hands is typically linked to involvement with explosives.

Van Damme also conducted experiments on how perchlorate traces can transfer between people and environments. This is similar to how DNA can be transferred. The experiments included transfer through handshakes. They also included exposure in spaces where explosives are manufactured.

The NFI said the research has already been used as evidence in several court cases. However, the institute emphasized that further study is still needed. One unresolved issue is how long perchlorate remains detectable on skin or objects.