Dominant Industry Dominant Blue: Standard Series Ink

Round-bottomed 25 ml bottle of deep blue ink drawn in proportion, beside a swab card for Dominant Industry Dominant Blue — Dominant Blue in its 25 ml bulb bottle, drawn in proportion. Original illustration made for this guide. © Stationery Times.

Product facts

Product

Dominant Industry Standard 104 Dominant Blue fountain pen ink, 25 ml

Brand

Dominant Industry

Brand origin

South Korea

Made in

South Korea^*

Material

Glass bottle

Good for

Journaling and planning

Price range

$$$5–20 per item

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Notes on these facts

Made in South Korea: Dominant Industry's own site calls itself a Korean ink company but does not print a made-in line on the product page. Galen Leather's spec row lists the origin as South Korea. Source. Price: example listing.
How we test and disclose samples: How we test stationery.
Price bands are typical US retail, checked October 2026.

Key takeaways

The bottle holds 25 ml (0.85 fl oz), enough for about 31 fills of a 0.8 ml LAMY Z28 converter.
Dominant Industry says even its most acidic ink is only mildly acidic, comparable to everyday liquids such as milk.
Dominant Blue is number 104 in the Standard series, which the maker's menu runs from 100 to 121 across at least 17 numbered colors.
On November 1, 2026 Galen Leather listed it at US$17.00 and showed it sold out, inside our $$ band ($5-20).
The maker's swab and written samples show a blue that pools to a darker purple edge; no water resistance or pH figure is published.

What is Dominant Industry Dominant Blue?

Dominant Blue is Standard 104, the maker’s blue named after itself, in a 25 ml (0.85 fl oz) glass bottle. Dominant Industry’s product page pairs a photo of a bowl of bright blue powder with the ink swab, which suggests a deep, saturated blue.

The brand page says the company is “a Korean ink company” that draws on nature, and that “dominant color” is the idea behind the name. A color called Dominant Blue is the maker’s plainest statement of that idea.

Dominant Blue specs

Spec	Value
Maker	Dominant Industry, South Korea
Series	Standard, number 104
Volume	25 ml (0.85 fl oz), glass bottle
Bottle opening	18 mm (0.71 in), per Galen Leather
Bottle shape	Round-bottomed bulb with a dark cap (maker’s photo)
Acidity	“Mild”, comparable to everyday liquids such as milk for the most acidic Dominant ink (maker); no pH figure
Water resistance	Not stated
Release date, barcode	Not stated
Price band	$$ ($5-20 per bottle)

Galen Leather’s spec row lists a 30-second dry time, the same figure it prints for Apple Blossom, so treat it as a shop template rather than a test.

What color is Dominant Blue on paper?

On the maker’s own samples it is a deep blue that turns purple at the edges where the ink pools. The swab, made with a glass muddler, shows lighter blue in the middle of the strokes and a dark plum rim. A loop exercise written with a Brause cito fein nib reads as navy to violet-blue.

Those are the maker’s photographs of its own samples, not a test by us. Paper changes how much of the purple edge appears, so judge it on the paper you use.

Who is Dominant Industry Dominant Blue for?

It suits people who want one dependable blue from a small Korean ink range for everyday fountain pen writing.

Journaling and planning: Dominant Industry says its inks are formulated with mild acidity to be gentle on writing instruments, and the bottle holds 25 ml.

Skip it if you need a waterproof or document ink: no water resistance is stated.

How many times can you fill a pen from one bottle?

A 25 ml bottle fills a LAMY Z28 converter about 31 times. The table divides the bottle by each filler’s capacity and rounds down.

Filler	Holds	Fills per 25 ml
Pilot CON-40 converter	0.4 ml	about 62
LAMY Z28 converter	0.8 ml	about 31
TWSBI ECO piston	1.76 ml	about 14

Bar for the 25 ml Dominant Blue bottle with fills per bottle for three fillers — One 25 ml bottle, and how many fills of three common fillers it holds. Original illustration made for this guide. © Stationery Times.

See the Pilot CON-40 and LAMY Z28 guides for the converters.

How does Dominant Blue compare with other blues?

It is a 25 ml bottle, small next to the 50 ml of LAMY T52 and the 50 ml of Pilot Iroshizuku Kon-peki. Those two are the usual references for a plain blue. Dominant Industry publishes no shading, flow or dry-time numbers for Dominant Blue, so we cannot rank it against them. For glitter, see Apple Blossom; for the scented series, Duftrausch.

Background on the properties people compare is in fountain pen ink properties explained.

Where is Dominant Industry Dominant Blue made?

In South Korea, according to Galen Leather; the maker says only that it is a Korean ink company. Dominant Industry prints no factory, town or made-in line on its pages, and its product page links to a Naver Smartstore shop.

On November 1, 2026 Galen Leather listed the bottle at US$17.00 and showed it sold out. Prices and stock vary by shop; we place it in the $$ band.

For a brown ink with a pooled edge, see Lennon Tool Bar Sesame Oil.

Frequently asked questions

How much ink is in a bottle of Dominant Blue?

25 ml (0.85 fl oz). Dominant Industry prints "Bottles: 25ml" on the product page, and Galen Leather lists a glass bottle with an 18 mm opening.

Why is it called Dominant Blue?

It shares the maker's name. Dominant Industry says it is named for the dominant color in a palette, and this blue is the Standard series' namesake. The maker gives no further story.

Is Dominant Blue a shading ink?

The maker's samples show a lighter blue in the middle of strokes and a darker purple edge where the ink pools. Dominant Industry does not publish a shading rating.

Is Dominant Blue safe for all fountain pens?

The maker says its inks are mildly acidic to be gentle on writing instruments. Galen Leather says it suits piston and converter pens, but that is a retailer claim; Dominant Industry publishes no pen list.

Is Dominant Blue waterproof?

Not stated. Neither the maker nor Galen Leather gives a water-resistance claim, so expect it to run on a wet page.

How many fills does one Dominant Blue bottle give?

About 31 fills of a 0.8 ml LAMY Z28 converter, 62 of a 0.4 ml Pilot CON-40, or 14 of a 1.76 ml TWSBI ECO, from dividing 25 ml by each capacity.

What is the difference between Standard and Pearl inks?

Pearl is the maker's glitter range, with particles up to 50 micrometres. Standard is its numbered 100-series line; the maker's page for Dominant Blue makes no glitter claim.

Where is Dominant Blue made?

Dominant Industry calls itself a Korean ink company, and Galen Leather lists South Korea as the origin. The maker names no factory on its own pages.

Sources (4)

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