Getting Rid of Graffiti with a Two-Wavelength Laser A combination of ultraviolet and infrared radiation may be able to blast graffiti off of valued stone monuments, restoring them for future generations

Graffiti on the Berlin Wall may have become a symbol of freedom, but many heritage structures around the world are in grave danger of being scarred for eternity by a can of spray paint. From professions of love and profanity READ MORE