Monteverde USA is proud to have created the world's latest leading European ink treatment formula (ITF). Enjoy peak performance with ITF which drastically improves ink-flow quality, extends cap-off time, and lubricates and protects the ink feeding systems from corrosion and clogging. Our inks are available in a variety of vibrant colors.This Monteverde Gemstones Collection boxed set contains 10 fountain pen ink colors, each in a 30ml glass bottle. The ink colors include: Amethyst, Charoite, Erinite, Fireopal, Garnet, Olivine, Onyx, Ruby, Sapphire, and Topaz.