Diamine x Cultpens Deadly Nightshade Full Bottle Fountain Pen InkThis Cult Pens exclusive ink was created for Hallowe'en in 2024. It has a dark purple plum base with a ghastly green sheen, and a shiny silvery shimmer. And if you take a look into the bottle, you might find something looking back! Two skulls float ominously on the surface. If you've ever struggled to shake your shimmery ink up, you won't have that problem here. The skulls help to quickly loosen up the ink when shaken.