Herbin uses all natural dyes in their fountain pen inks. This natural composition is reflected in the very neutral pH of the inks. Universal snap-in cartridges. 6 cartridges are neatly and securely packed in a cylindrical metal tin. (Fits all pens except Sheaffer, Parker, Lamy, A.T. Cross, Pilot/Namiki, Sailor, Platinum, Aurora, Fultz and Nakaya)
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