Archaeologists may soon have a new tool to peer beneath the surface of excavation sites before breaking ground. A team of researchers in Denmark has developed a portable LED multispectral imaging system, called LEDMSI, that uses 16 different wavelengths of light to reveal features invisible to the naked eye. The technology could help archaeologists evaluate sites more efficiently, decide where to dig, and even spot materials that might yield valuable biomolecular information.
The system, described in a statement from Aarhus University, employs LEDs spanning visible light, near ultraviolet, and near-infrared ranges. Because different materials absorb and reflect light in distinct ways, the multispectral approach can highlight variations in soil composition, buried structures, or organic remains that would otherwise go unnoticed. The researchers tested the device at Sorte Muld, an Iron Age site on the Danish island of Bornholm, whose name translates to "Black Soil."
"The images looked almost psychedelic when we took them, and we only really saw what we had when we analyzed them back at the computer," said Søren Munch Kristiansen of Aarhus University, who led the work alongside David Stott of the Moesgaard Museum. "Then we could see new layers and changes in the fill that we simply could not see with the naked eye."
At Sorte Muld, the LEDMSI system revealed a subtle change in the ground surface that may indicate a break in activity at the site—a hypothesis the team plans to test through excavation. The system also caused small bone fragments to fluoresce under ultraviolet light. Previous research has linked such fluorescence in archaeological bone to the presence of collagen, a protein that can be useful for DNA and protein analysis, potentially offering a non-destructive way to identify materials of scientific interest before they are disturbed.
The development of LEDMSI is part of a broader trend in archaeology toward non-invasive survey techniques. Traditional excavation is time-consuming, costly, and inherently destructive, so methods that can help archaeologists prioritize where to dig—or even avoid digging altogether—are increasingly valuable. The new system is designed to be used directly in the field, making it practical for initial site assessments.
Kristiansen and his colleagues are continuing to refine and test the LEDMSI system. They hope that with further development, it could become a standard tool for archaeologists working on a wide range of sites, from prehistoric settlements to historic urban deposits. The ability to quickly identify areas of interest or potential biomolecular preservation could help researchers make more informed decisions about where to focus their efforts.
The research also highlights the growing role of advanced imaging technologies in archaeology. Multispectral imaging has previously been used to analyze artifacts, such as the so-called "World's Oldest Book," but applying it to in-field site evaluation represents a new frontier. As the technology matures, it may offer a window into the past that is both less invasive and more revealing than traditional methods alone.
