Special ink formula won't dry up - even when the cap is off Special ink formula. Ink formula will not dry up, even if left uncapped for 7 days! Chisel tip with rigid point ensures precision. No matter how crowded the text or how small the space, the fine tip lets you mark the exact spot. Rigidity helps keep line narrow. Bright inks light up your work. Dynamic color pops off the page - makes your work easy to locate. Smudge-resistant - great for left-handed users! Ink is odorless and nontoxic so it's safe for all work areas.