Fairfax, Va., Uncovers History With Multispectral Imaging With the help of multispectral imaging technology, the city of Fairfax, Va., has uncovered hidden meaning in the graffiti left behind in a historical site by Union soldiers during the Civil War. August 04, 2021 • Photo courtesy of R.B. Toth Associates The city of Fairfax, Va., embarked on a project last year using multispectral imaging technology to analyze Civil War-era graffiti in a local historic site. Technological tools have proved useful in reviving historical spaces and multispectral imaging, specifically, has been very successful in the detection of hard-to-discern details such as environmental threats. The project, titled