– 15 mm marker felt
– 20 ml ink
– Transparent when applied
– Ink reacts to UV light (artificial light also possible)
– Only becomes visible after hours
– Ink turns dark brown and is extremely permanent
– Warning: Very difficult to remove!
– Can be used on all common surfaces

The game changer! The ink is completely transparent at the beginning and only turns dark brown after a while. The ink slowly starts to change color when exposed to UV rays (sunlight and artificial light possible). The originally transparent ink turns deep dark brown and is extremely difficult to remove. The perfect marker for making discreet, long-lasting markings.