Posh/Snooty Hague fountain pen ink made by P.W. Akkerman pen store in The Hague.  It is a rich chocolate brown color.

Originally made to celebrate their 100th anniversary, this ink comes in a vintage-style bottle with a narrow neck with a marble stopper, to create a well at the top to aid in filling pens.

The more affluent citizens of The Hague are usually called "Hagenaars" and speak so-called bekakt ("posh") Haags, this contrasts with the Hagenezen, who speak plat ("vulgar") Haags. Ackerman