In our days it is considered one of the most powerful indelible inks and is among the top choices of writters around the world.
Nero D'Inferno has been a graffiti community standard for more than 20 years, and in particular since the late 1990s. It is an alcohol-based ink manufactured by Fabrica Chemica Unione (FCU) in Italy, and was originally intended for dyeing leather garments. However, it quickly became popular due to its ability to apply perfectly on any surface you choose to paint and mainly because it is absolutely permanent.