Sailor Studio Ink Bottle (641 Turquoise - 20ML) 13-1210-641

Sailor Studio Ink Bottle (641 Turquoise - 20ML) 13-1210-641

The Sailor Ink Studio 641 (also often described as Turquoise or Teal) is part of Sailor’s expansive Ink Studio collection — a line of 100 carefully formulated dye?based inks designed to deliver vivid color, dependable performance, and safety for fountain pens. In a compact 20?mL glass bottle, this ink offers both aesthetic appeal and practical usability. 

The bottle is square in profile (approx. 34 × 34 × 58 mm) and sits in a paperboard box. The packaging from Sailor includes small labels (stickers) to mark your converter or pen with the ink name, which is especially useful when rotating inks. 

Color & Visual Character

Color 641 is often characterized as a dark teal / turquoise (a blue?green leaning shade) with strong saturation.  In testing and reviews, it shows high shading — that is, under heavier or wetter strokes you can see richer variations in tone, from deeper edges to lighter mid?strokes. 

In swatch & chromatography tests, Sailor 641 tends to bleed outward edges of turquoise / greenish tones, producing a gentle, diffused halo or soft gradient effect.  It doesn’t exhibit noticeable sheen or glitter — its beauty lies more in its shading and depth of color rather than metallic effects. 

Technical & Performance Characteristics

Use Cases & Appeal

• Perfect for those who want a rich, expressive teal / turquoise that offers both boldness and elegance.

• Excellent in pens and nibs where shading adds character (e.g. flex or broader nibs).

• Useful for journaling, sketching, correspondence, and creative writing — when you want more life than a flat blue but still want professionalism.

• The included converter labels help manage multiple inked pens and avoid confusion.

• Works well on high-quality fountain pen paper to bring out its tonal depth; on thinner or lower-grade paper, expect somewhat muted effect and possible feathering.

Comparative & User Impressions

• In the Mountain of Ink review of Ink Studio set #12, 641 is included among related colors. In their test, 641 showed low sheen and medium shading, and on fountain?pen friendly papers the dry time was ~30–40 seconds; on standard copy paper significant feathering occurred on larger nibs. 

• Fountain Pen Pharmacist in their review described 641 as a “dark teal with high shading” and noted smooth flow, though with moderate dry times. 

• In color swatch tests, 641 is described as blending easily with water and bleeding “turquoise at the edges,” with “no sheen in evidence” during those tests. 

• According to Anderson Pens, 641 is labeled in their catalog as a dark teal in the Ink Studio line.