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Stealth - squeezer marker. 80ml of Stealth Ink already filled in the marker with the best ink flow control - great for drip lovers !
80 ml 
- filled in resistant squeezer marker
- includes 13mm mohair nib 
- marker is refillable
- invisible when applied
- appears after contact with UV rays -- turns into dark brown / black shade
- super long lifespam -- almost impossible to buff !
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.