Stealth Ink Marker [40ml]

The Stealth Ink Marker 40ml is a 20mm chisel-tip marker filled with a colourless, water-like ink that stays invisible until it reacts with UV light. It appears almost instantly in direct sunshine and more slowly in shaded spots, settling into a shade from dark brown to black. With twice the ink of the standard 20ml marker, it’s built for longer sessions. Very permanent on absorbent surfaces and almost impossible to buff.