(Susan M. Pigott is a fountain pen collector, pen and paperholic, photographer, and professor. You can find more from Susan on her blog Scribalishess.)
The Colorverse Johannes Kepler Mini 3 Bottled Ink Set contains three 5ml bottles of dye-based fountain pen ink honoring Kepler, the famous astronomer and mathematician. The three inks in the set are called "Conjecture," (for Kepler's mathematical theorem on sphere packing) "Planetary Motion" (for Kepler's three laws) and "Somnium" (for Kepler's novel about a dream involving daemons and the moon).
The 5ml bottles are tear-drop shaped and adorable.
That said, the bottles aren't very practical. The opening is only .7mm, so you cannot insert nibs into it. A mini-pipette comes with each bottle. You can fill converters and eye-droppers with the pipette but not piston-filled pens.
Conjecture
Conjecture is a wine colored ink with fair saturation. It exhibits little shading and no sheen on Rhodia paper, and it is not waterproof. Although my dry times test shows the ink smearing after 30 seconds, I think that's because a bit of ink had pooled. The ink is actually quite dry.
The Col-o-dex card also shows some shading but no sheen. I had to soak up the ink splats with a paper towel because sunlight was fading (and I needed to take my photos), so it's possible that ruined any sheen effect.
Most interesting is the chromatography. This ink has a surprising bit of yellow-green in it along with pink and magenta. The yellow-green actually shows up in my water test (see above), but it wasn't evident in any of my writing, swatches, or splats.
Because the bottle is so small, I wasn't able to test the ink with my ruling pen. I opted instead for my widest Pilot Parallel pen (2.4mm). In this wider nib (which I dipped) the ink seems much lighter--more of a cherry blossom color than wine. Shading is much more evident in a wider nib.
Planetary Motion
Planetary Motion is a denim blue color. It has a bit of shading but no sheen and dries quickly. It is not waterproof, but when water is mixed with it, you can see the purple and teal undertones of the ink.
The Col-o-dex card shows off the shading of the ink. Again, it does not have any sheen (maybe due to my paper-towel blotting) but a bit of teal is visible in the splats.
The various dyes in Planetary Motion come out clearly in the chromatography: teal, turquoise, light blue, lavender, and purple.
Testing on Midori Paper with the Pilot Parallel 2.4mm demonstrates decent saturation and shading.
Somnium
Somnium is a jade green color with a tiny bit of shading. It has low saturation except in swabs. It dries fairly quickly and is not waterproof.
On the Col-o-dex card, the ink looks rather flat, with just a tiny bit of shading with the fine nib. Again, because I had to blot the splats, I don't know if there's any sheen with this ink. If there is, it's quite small.
Chromatography reveals different shades of green in this ink: olive green, light green, and blue green.
The Pilot Parallel pen brought out some good shading in Somnium.
I found all three Colorverse inks in this set to be quite dry, especially in the fine nib I used to do longer writing samples. The colors are understated, and I'm not enthusiastic about any of them. They are much more interesting in the Pilot Parallel nib, so I suggest using wide nibs for these inks.
You can buy the Colorverse Johannes Kepler Mini 3 Bottled Ink Set from Goldspot Pens for $19.50. Keep in mind that you'll need to use these inks in pens that are either eye-droppers or cartridge/converters. You could also transfer the ink to a sample bottle in order to fill a piston-based pen.
(Goldspot Pens provided this Colorverse Ink Set to Pen Addict free of charge for review purposes.)
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