- colorless (invisible) when applied
- appears after contact with UV rays
- turns into dark brown / black shade depending on intensity of exposure and used surface
- very permanent - super long lifespam - almost impossible to buff!
- comes in resistant bottle with injection cap to prevent mess during refills
Invisible Stealth Ink formula is enhances by the UV rays - best by sunshine or any other light. The more your mark is exposed to UV rays, the darker it gets.
Direct sunshine works the best, subway lights takes longer - same with summer and winter condition.