The HP 746 Chromatic Red (P2V81A) is a 300‑ml pigment-based ink cartridge made for large‑format HP DesignJet printers (like the Z6 and Z9+ series). It produces a deep, vivid red color (chromatic red) that’s water- and fade-resistant. Using HP’s Vivid Photo Ink technology, it’s designed to deliver high-contrast color while helping reduce the number of different inks needed. Prints made with this ink are long-lasting — HP says they can last over 200 years in dark storage.