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.

Nassaus Blauw is named for the blue worn by the House Nassau, who make up the ancestry of the Dutch Royal Family.

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.