What ink do sharpies use?

Sharpies use a specially formulated permanent ink that contains dyes, solvents, and resins. This ink is designed to be quick-drying, water-resistant, and fade-resistant, making it suitable for a variety of surfaces. The precise composition can vary slightly depending on the specific type of Sharpie (e.g., fine point, ultra-fine point), but all are intended for permanent marking.