Robert Oster Deep Sea Fountain Pen Ink — 50 mL

Robert Oster Deep Sea is a saturated teal that moves between blue-green depths and brighter turquoise passages. On fountain-pen-friendly paper, a pink sheen can surface over the darkest pooled areas, giving the color a second layer without changing its basic readability.

Independent testing generally finds medium shading, visible pink sheen, and average flow. The sheen is paper-dependent: on absorbent paper it may nearly disappear, while coated paper and wetter nibs allow it to develop. This is not a shimmer ink.

Ink character

• Color: deep teal / blue-green
• Shading: medium
• Sheen: pink on ink-friendly paper
• Shimmer: none
• Flow: moderate
• Water resistance: low
• Best suited to: journaling, correspondence, medium and broad nibs

Deep Sea is restrained enough for long passages, but good paper reveals the hidden warmth at the edges of its darkest strokes.