Fountainfeder on Twitter: "The currently favourite blue sheeners in the shop are Diamine Skull & Roses, KWZ Sheen Machine and Robert Oster Fire&Ice. Have you already tried all of them? Swabs are
Diamine Maureen, compared to the sheen of Skull and Roses and Jalur Gemilang : r/fountainpens
Diamine Skull and Roses/OS Nitrogen comparison : r/fountainpens