Diamine Inkvent Black Edition 50ml - Vibe Extreme Sheen

Diamine Inkvent Black Edition 50 ml – Vibe (Extreme Sheen) is a richly saturated, dark plum-to-blue‑black fountain pen ink that surprises with a vibrant turquoise / red sheen, thanks to its Extreme Sheen formula.  It's part of Diamine’s 2024 Inkvent Black Edition collection, featuring 25 special colors released in 50 ml bottles.  The base color is deep and moody, but in broader or wetter nibs you can really bring out the dramatic, high-contrast sheen that makes this ink a standout on high-quality paper. Users note it's “a pretty teal with loads of red sheen.”