P.W. Akkermanis a pen store in The Hague, Netherlands that was founded in 1910. To celebrate their 100th Anniversary in 2010, they released a line of inks with a very distinctive ink bottle.

Three guesses where this name comes from Is a rich mid-tone blue that shades just beautifully. While Akkerman No. 5 may get a lot of love, No. 3 is perhaps an undersung gem.

Theink bottle fills by tipping the bottle upside down so that ink flows from the large bottom section, into a small upper section. When you tip the bottle back up, a small marble rests in the neck of the bottle to create a reservoir, making it easy to fill the fountain pen. The P.W. Akkerman bottles contain 60mL of inks, while the name of each colour has been named after a different location in the Hague.