Laser cleaning of graffiti from building Stone using high power diode laser

Research demonstrates that high-power diode lasers can effectively remove graffiti from the historic stone of Morelia's UNESCO World Heritage Centre without causing damage. The study found that continuous wave laser treatment outperformed modulated wave regimes, with a two-pass process showing significant improvement over single-pass methods. This approach offers a non-damaging alternative to conventional graffiti removal techniques, preserving the aesthetic integrity of the Pink Morelia Quarry stone used in the city's architecture.

Penide, J., Quintero, F., Riveiro, A., Sánchez-Castillo, A., Comesaña, R., del Val, J., Lusquiños, F., & Pou, J. (2012). Laser cleaning of graffiti from building Stone using high power diode laser. ICALEO 2012: 31st International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing, 596–601. https://doi.org/10.2351/1.5062513