Question 1

What color is Diamine Marine ink?

Accepted Answer

Diamine Marine is a really pretty turquoisey, tealy-blue ink. It sits in that blue-green zone where it still reads blue, but it’s got that teal vibe. It also gives you some really nice shading, which is why I like it so much.

Question 2

Is Diamine Marine water resistant?

Accepted Answer

I did a water resistance test, and I wouldn’t call it truly water resistant. There’s maybe a little bit left behind, but not enough for me to feel safe. I personally wouldn’t use it on the outside of an envelope if there’s any chance it’ll get wet.

Question 3

Does Diamine Marine shade well?

Accepted Answer

Yes—this ink has some nice shading going on, and you can see it clearly on the comparison panel. On good paper, it looks especially pretty and dimensional. It’s one of those inks that’s just satisfying to write with.

Question 4

How does Diamine Marine perform on cheap paper like Walmart or Five Star?

Accepted Answer

On Pen+Gear envelope paper and heavyweight notebook paper, I saw feathering, bleeding, and ghosting—no surprise there. Five Star was also a mess with feathering, bleeding, and ghosting. If you love this color, you’ll get the best results on fountain-pen-friendly paper.

Question 5

What papers worked best with Diamine Marine in your test?

Accepted Answer

Rhodia 80gsm was excellent: no feathering, no bleeding, no ghosting, and pretty shading. Midori MD, Tomoe River 68gsm, and the Hobonichi-style 52gsm notepad also looked beautiful with minimal to barely any ghosting. Archer & Olive 160gsm was super clean too—no bleeding and no ghosting.

Question 6

What did your chromatography show for Diamine Marine?

Accepted Answer

On the toilet paper chromatography, I could see a darker blue and a lighter blue separating out. With water, the lighter blue moves outward, and with rubbing alcohol it does something similar but with a darker splotch right in the middle. It’s a really interesting split for a teal-leaning ink.

Question 7

What inks is Diamine Marine similar to?

Accepted Answer

When I started comparing, I realized it’s more teal than straight light blue. In my swatch books, inks like Diamine Bliss and Zaka Kank felt kind of close, and Taquas de Pep read a little bluer. And honestly, Diamine Marine is right up there with Diamine Subzero for me.

Diamine Marine

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