The highly celebrated Grog "Buff Proof" 200ml refill ink is now available. The name says it all! Very opaque and resistant to many chemical agents. Neither rain nor sun nor any other atmospheric agent can attack it. Use to refill your favorite marker or mop and let the fun begin!
Always use gloves when refilling a marker, and never refill over important counter tops or tables. This is a powerful ink and will stain anything it touches.