Stealth Ink refill [100ml]

Stealth Ink Refill 100ml is a colourless, water-like liquid that stays completely invisible until it reacts with UV light — appearing almost instantly in direct sunshine and more gradually in shaded or indoor spots, settling into a shade ranging from dark brown to black. Extremely permanent on absorbent surfaces and notoriously hard to buff out, it’s a distinctive refill for markers and squeeze-style tools built for a slower, stealthier reveal.