This is the Diamine Inkvent 2024 Day 21 door:

Day 21’s ink is Diamine Cosmic Glow, and Extreme Sheen ink that has a royal blue base colour and extreme pink sheen. I used a Lamy Safari fountain pen with a medium nib to test out this ink.

Diamine Cosmic Glow utterly earns its name and its Extreme Sheen designation. The base colour is a very rich, deep, saturated purplish blue, and the pink-purple sheen overlays much of it, literally making it glow.

Here’s an angled view of the Col-O-Ring swab, where you can better see the extent of the sheen on this ink:

Diamine Cosmic Glow sheens less than Diamine Vibe but it still shows a lot of sheen on every letter, even with fine nibs, even on relatively absorbent Rhodia paper:

Here’s an angled view of the writing sample where you can see the sheen:

On original Tomoe River paper the sheen is even more clear:

And you can see it well on Midori MD Cotton paper in today’s bear sketch:

A closer look at the sheen on Midori MD Cotton paper (you’ll notice that since Diamine Cosmic Glow is a very saturated ink, there’s no shading visible with this ink):

Today’s bear is very special and precious to me. I bought it a long time ago in a beautiful store in Greenwich, London that no longer exists. It was in the Greenwich market, part of an array of wonderful and unique shops that no longer exist in the market, and it sold doll houses and doll house things for collectors, and collector’s teddy bears. People who were trying to create doll houses that were period specific would go there and could find everything, from the house to the wallpaper, furniture, dolls, cutlery, stoves, etc. You could build a Victorian house, including servants and servant quarters, or a ’60s flat, all to the highest level of precision. Apart from that they had a stunning, large and wide selection of collectors’ teddy bears, and the patience to explain the ins and outs of hand made, limited edition teddy bears to a new collector like me. I purchased Midnight Micky (this bear’s name) because he was a black bear, and the only black bear in a store with hundreds of bears on display. The couple that ran the store explained that black bears are difficult to make, and so there’s very few of them. Midnight Micky is one of two bears made by hand by a small English maker, and I cherish him very much both because I love his looks and because he’s one of the few bears I have from that lovely shop, Greenwich Bears.

Diamine Cosmic Glow is likely going to be one of this Inkvent’s stars, and not only because so many of this year’s inks are on the darker or more muted side of things. Its rich and beautiful base royal blue colour in itself would make it pop, but with the added glow of extreme purple-pink sheen it really becomes a super-star. I wouldn’t trust this ink with a vintage fountain pen, and it takes a good long while to dry, but it’s a fabulous ink and one that I would consider buying a full bottle of.

What do you think of Diamine Cosmic Glow? How do you think it compares to Diamine Vibe?