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Monteverde USA® is proud to introduce the worldâs latest leading European ink treatment formula which drastically improves ink-flow quality in all fountain pens and liquid inkrollerballs, such as Monteverdeâs Inkâ¢Ballâ¢pens.ITF⢠Ink Treatment Formula that:⢠Drastically improves ink-flow quality⢠Extends cap-off time⢠Lubricates and protects the ink feeding systems from corrosion and clogging⢠Improves ink drying time on paper⢠Extra large 90ml ( approx. 3oz ) bottle⢠Individually labeled for easy color identification