opal green

Robert Oster Opal Green is a blue-leaning green ink that appears minty on finer nibs and more emerald on wider ones, with attractive shading properties across most paper types. Known for its non-toxic, eco-friendly formulation and fast drying time, it works well with all nib sizes but lacks water resistance. Best suited for writers who prioritize color character and shading effects over durability, particularly on quality papers.