their initials and messages and how long we need how the. much energy to take the more. the creators of the graffiti commando actually specialize in medical lasers but their experience developing precision based devices has come in useful in tackling cleaning and restoration. damage the surface layer of the monument isn't damage in the process this type of laser has really low energy pulsations and high frequency repetitions. that means that it can work on all colors without causing any damage or putting the surface at risk of future. but the innovation comes at a pretty steep price the device cost seventy eight thousand dollars. just as well then that the city of florence got it as a gift. a blockbuster video rental store in the u.s.