Sailor Studio Ink Bottle (840 Blue - 20ML) 13-1210-840

Sailor Studio Ink Bottle (840 Blue - 20ML) 13-1210-840

The Sailor Ink Studio 840 Blue is part of Sailor’s Ink Studio collection — a curated series of 100 unique, dye?based fountain pen inks developed from the brand’s ink mixing tradition and feedback from ink enthusiasts. The 840 variant sits in the blue family, offering a balanced, mid-tone blue that leans neither too dark nor too light.

Each bottle contains 20?mL of ink in a square glass container (approx. W?34 × D?34 × H?58?mm) and comes with a set of small converter / pen labeling stickers for marking which ink is loaded. ( ) Sailor states that all Ink Studio inks use water?based dye formulations and are specifically designed to be safe for fountain pens.

Color & Visual Character

• In reviews, 840 is described as a true, medium blue — neither leaning heavily toward teal nor toward navy. The Fountain Pen Pharmacist calls it “a typical medium blue.” 

• In swatch / chromatography testing, 840 shows interesting edge diffusion: it “bleeds out greys, pink and turquoise at the edges” under wet spread conditions, and has some slight sheen under favorable lighting. (Nick Stewart’s swatch tests) 

• Goldspot describes 840 as an indigo / blue with medium sheen, purple hues, and medium shading properties. 

Performance, Behavior & Practical Features

• In the Fountain Pen Pharmacist review, 840 exhibits moderate drying time, medium shading, and medium sheen behavior on Tomoe River paper. The ink behaved well in a Jowo nib and produced consistent, smooth flow. 

• According to Anderson Pens, the ink is “rich shade of blue,” “very well behaved, has good flow, and is easy to rinse out of your fountain pen.” 

• From the Goulet listing:
   • Bottle opening: 20.6 mm 
   • The ink is not fast drying, not fluorescent, not freeze resistant, no shimmer / glitter, and is a dye (non?pigmented) ink. 

Use Cases & Appeal

• Ideal for users seeking a balanced blue that feels safe for daily writing yet still shows character (sheen, shading) under the right conditions.

• Works across a range of nib sizes — in medium or wetter pens, shading and sheen become more visible.

• Due to the edge diffusion behavior, the ink can produce visually appealing halos or feathering “edge colors” in artistic swabs or wet spreads.

• Because it’s not overly saturated, 840 may dry reasonably well on good papers, making it more practical for regular writing.

• The converter labels help if you use multiple inks or rotate colors across pens.

• For maximum visual impact (sheen, shading), use on fountain?pen friendly, low?absorbency paper (e.g. Tomoe River, Rhodia, etc.). On more absorbent or standard paper, the effect will be flatter.