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Quick answer
Diamine Polar Glow is a bright blue fountain pen ink with a strong pink-to-red sheen, first sold in Diamine's 2019 Inkvent calendar and now a regular 50 ml bottle in the Blue Edition. It's a water-based dye ink with no shimmer, a wet flow, low water resistance and a dry time of about 15 to 20 seconds.
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The 50 ml Inkvent bottle, drawn in proportion, with a swab of the ink.
Product facts
Product
Diamine Polar Glow fountain pen ink, 50 ml Inkvent bottle
Water-based, non-toxic, acid-free, vegan-friendly dye ink in a glass bottle (Diamine)
Released
2019*
Price range
$$$5–20 per item
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Notes on these facts
Made by Diamine-Speciality Inks Limited, Merseyside, England. Made in United Kingdom: Diamine's history page says the brand makes its inks at its own facility near Aintree Racecourse, on the edge of Liverpool (see our Diamine Oxblood guide). Diamine's Polar Glow listing (read on October 22, 2026) doesn't print a country of origin. Source. Price: example listing. Released: Diamine says Polar Glow comes from its 2019 Inkvent Calendar (Blue Edition); Mountain of Ink says it was later sold on its own in the Blue Collection.
Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43 = CZK 21.7; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).
Key takeaways
Diamine says the 50 ml Polar Glow bottle holds full-size ink from its 2019 Inkvent Calendar, the Blue Edition.
On October 22, 2026 it was 36th on Goulet's best-seller list, with 74 reviews averaging 4.81 out of 5.
Mountain of Ink timed it at 15 seconds to dry and rated the pink sheen and shading high; Goulet measured 20 seconds or more.
Goulet lists it as not water resistant, not shimmering and not pigmented, so it suits any fountain pen.
Diamine's UK shop listed it at £10.08 (about US$13) before VAT; it sits in our $$ band in the US.
What is Diamine Polar Glow?
It’s a bright blue fountain pen ink known for heavy pink-to-red sheen, from Diamine’s Inkvent range. Diamine says it first came in the 2019 Inkvent Calendar, the Blue Edition, and is now sold in full 50 ml bottles.
It’s a steady seller in the US: on October 22, 2026 it was 36th on Goulet Pens’ best-seller list, where 74 buyers had rated it 4.81 out of 5. Goulet sums it up as a well-behaved, sheen-heavy blue with turquoise hints.
High pink (Mountain of Ink); red-purple tones (Goulet)
Flow
Wet (Goulet); average (Mountain of Ink)
Price band
$$ ($5–20 per bottle)
On October 22, 2026 Diamine’s UK shop listed the bottle at £10.08 (about US$13) before VAT, marked sold out. Diamine doesn’t publish the bottle’s dimensions, so our cover draws it in proportion.
How many converter fills one 50 ml bottle holds (bottle ÷ capacity), with Polar Glow's sourced properties.
How does Polar Glow look on paper?
Bright blue in normal writing, with pink to red-purple sheen where the ink pools. Mountain of Ink calls the base a bright medium blue and rates both shading and pink sheen high; Goulet says the sheen keeps it looking deep blue with red-purple tones.
The sheen depends on paper and nib. It shows best on smooth, coated paper such as Tomoe River and in a wet, broad nib. On Staples copy paper, Mountain of Ink saw feathering and bleeding with every nib size.
How fast does Polar Glow dry, and is it water resistant?
It dries in roughly 15 to 20 seconds, and it isn’t water resistant. Mountain of Ink timed 15 seconds; Goulet measured 20 seconds or more and warns that quick notes can smear.
In Goulet’s drip test the writing lightened to a pale turquoise but didn’t fully wash away. Mountain of Ink rated water resistance medium. For anything that must survive water, use a pigment ink such as Platinum Carbon Black.
Which pens is Polar Glow safe for?
Any fountain pen that takes bottled ink. Goulet lists it as not pigmented, not iron gall and not shimmering, and Diamine says its inks suit any brand of fountain pen, especially vintage ones.
Goulet rates it easy to clean, with possible slight staining on light-colored pens. A clear demonstrator such as the TWSBI ECO shows off the color; one bottle is about 28 ECO fills.
How does it compare with other sheening blues?
It’s brighter than Blue Velvet and bluer than Fire & Ice, with a pinker sheen than either. Details for the other inks come from our guides.
In England. Diamine says it makes its inks at its own facility near Aintree Racecourse, on the edge of Liverpool. The Polar Glow listing itself doesn’t print a country of origin.
Frequently asked questions
What color is Diamine Polar Glow?
A bright medium blue with turquoise hints, according to Mountain of Ink and Goulet. Where the ink pools it shows a pink to red-purple sheen.
Is Diamine Polar Glow a shimmer ink?
No. The glow is sheen, not glitter: Goulet lists it as non-shimmering, so there are no particles to clog a pen.
Is Diamine Polar Glow waterproof?
No. Goulet rates its water resistance low: a drip test lightened it to a pale turquoise, though the writing didn't fully disappear.
Why can't I see the sheen in Polar Glow?
Goulet says the sheen shows best with broader nibs on high-quality paper. Try a wet, broad nib on smooth paper such as Tomoe River rather than a fine nib on copy paper.
Was Polar Glow in the Diamine Inkvent calendar?
Yes. Diamine says the 50 ml bottles hold ink from its 2019 Inkvent Calendar, the Blue Edition.
Does Polar Glow stain pens?
Lightly at most. Goulet rates it medium-high for ease of cleaning and says it may slightly stain a light-colored pen body, which pen flush or soapy water should remove.
Is Diamine Polar Glow made in England?
Yes. Diamine says it makes its inks at its own facility on the edge of Liverpool, England.
