No. Light is measured in nanometres and there are two wavelengths of light that are emitted from this laser -one is invisible infrared light(1064nm) and the other is visible green light(532nm). The infrared wavelength is preferably absorbed into black and dark blue inks, whereas the green light is absorbed by red ink. It is possible to treat some other colours although white,yellow and bright colours are difficult. This is not usually a problem however, as lighter colours cover very easily. If you wish to cover- up an existing tattoo then the darker colours will be faded or removed, allowing you greater choice of size and colour of the cover-up design you choose.