Available in 21 different colours, this Monteverde 30ml bottle on fountain pen ink is the perfect way to express yourself with a different colour for every mood. With the world's latest leading European ink treatment formula (ITF) you can ensure your pen will write to its best capability. This unique ITF helps to drastically improve ink-flow quality, extend cap-off time, and lubricate and protect the ink feeding systems from corrosion and clogging.