MONTEVERDE USA Permanent Document Ink 90mL - BlackMONTEVERDE, who have always provided good value in fountain pen ink, have now come out with a much wider range of colours. Still in the same generous 90mL bottle and with very fast drying times, you can't go wrong. MONTEVERDE inks utilize ITF (Ink Treatment Formula) technology, which is probably a lubricant, to improve ink flow and cap off time. Most colours in the range are watersoluble, unless specifically marked Document Ink, which is permanent.