J. Herbin uses all natural dyes in their inks, which makes them non-toxic and pH neutral. This water based ink is smooth flowing and fast drying. J. Herbin is the oldest producer of ink in the world, making ink since the year 1700. Napoleon, Victor Hugo and Louis XVI all used J. Herbin inks! (These standard short cartridges fit all pens except Sheaffer, Parker, Lamy, A.T. Cross, Pilot/Namiki, Sailor, Platinum and Aurora.) 6 cartridges are neatly and securely packed in a cylindrical metal tin. (Note: Color samples are approximate. Use for general reference only.)Read more about how to insert ink cartridges into your fountain pen.