Sailor Studio Ink Bottle (642 Blue - 20ML) 13-1210-642

Sailor Studio Ink Bottle (642 Blue - 20ML) 13-1210-642

Sailor Studio Ink Bottle — 642 Blue / Blue?Black (20?mL) | 13?1210?642

Product Overview

The Sailor Ink Studio 642 is part of Sailor’s Ink Studio series — a curated collection of over 100 dye?based fountain pen inks, each with its own unique hue and personality. 642 stands in the “blue / blue?black” range of the series and is packaged in a compact 20?mL square glass bottle, along with converter labeling stickers for ease of use. 

The design is consistent with other Sailor Ink Studio bottles: a clear, squared glass container with a modest footprint, making it suitable for desk use, storage, or modest rotation among inks. The outer box often includes color charts or ink numbering guides as part of the presentation. 

Color & Visual Character

Color 642 leans toward a blue?black / dark blue — a mature and classic tone suitable for daily writing, professional correspondence, or situations where a more traditional color is appreciated. In swatch reviews, 642 exhibits:

• Low to medium shading — in normal writing it doesn’t dramatically shift between light and dark, though under wetter strokes or in broader nibs some tonal variation can emerge. 

• Medium sheen under certain conditions — on select papers (especially ultra?smooth or high-contrast papers) reviewers have seen some sheen. 

• Chromatographic effects / edge diffusion — when swabbed or wetted, the ink can bleed into subtle blue?green / turquoise edges, demonstrating its layered dye behavior. 

In one review, 642 is described as a “typical classic dark blue, consistent, smooth flow, quick dry time, low shading, medium sheen” — an ink suitable for more formal or everyday use. 

Swatch tests in the broader Ink Studio Set 8 series show that 642 dries in about 30–40 seconds on fountain?pen friendly paper, with low feathering, medium show?through, and some sheen / shading. On standard copy paper and in flex nibs, more feathering and bleed were observed. 

In the Sailor Ink Studio “Blue” swatch series, 642 is compared to similar blues in the line, and its behavior under water spread shows edge diffusion and a somewhat rich base tone. 

Technical Specifications & Behavior

Sailor’s official listing describes 642 as a “dark shade of blue?black”, emphasizes smooth flow, pen safety, and that each bottle includes converter labels. 

Use Cases & Appeal

• This ink is well suited for those seeking a classic, formal blue that is more expressive than a flat “blue?black” but still conservative enough for professional use.

• Ideal for daily writing, journaling, letters, or school / business scenarios where readability and legibility matter.

• For those with broader nibs or wetter pens, shading and slight sheen may emerge, adding nuance to the writing.

• Because it’s a dye ink, regular maintenance (flushing) is recommended, especially if pens are unused for extended durations.

• The compact 20?mL size encourages experimentation or rotation among inks without committing to large volumes.

Comparative & Reviewer Impressions

• The Fountain Pen Pharmacist ink review describes 642 as “a quintessential navy — classic, yet refined,” with consistent smooth flow, quick drying, low shading, and medium sheen. 

• In the “Set 8” review by Mountain of Ink, 642 is noted to have medium sheen, medium shading, low feathering on good paper, and is grouped with similar blue inks. 

• The Dromgoole’s description highlights a “blue black with a red sheen” relation (some reviewers see a slight red/sheening effect in deep or dark areas) as a unique characteristic. 

• In comparative swatch tests, 642’s edge diffusion and dyes’ layered behavior are apparent — edges pull into faint turquoise or lighter blue tones under water spread.