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Tom's Studio Ori Highlighters in Three Colors

New Pen Day! Setting Up the Tom's Studio Ori Refillable Highlighter (And Cleaning Out the Lumos)

June 10, 2026

Tom’s Studio recently announced their latest product - an “infinitely refillable” version of a product that isn’t supposed to be refillable: the highlighter. Dubbed the “Ori,” this new pen works on the same principle as the Lumos and Wren refillable fineliners. Each Ori highlighter pen features a double-ended design with two replaceable cotton reservoirs and marker-style tips. To fill the pen, you dip the end of the reservoir into the ink and watch as the ink saturates the filling system and the tip. Each bottle of Tom’s Studio highlighter ink also includes a small eyedropper, and Tom’s Studio suggests that you apply a drop or two to the tip of the marker to ensure adequate saturation and ink flow.

It never gets old watching these things fill up.

I’m really happy to see a product like this reach market. Way back in the early 2010s, what prompted me to start exploring better stationery was the waste inherent in disposable pens, and especially plastic highlighters. Working in a research-intensive profession, I would churn through highlighters at a somewhat astonishing pace, though my current burn rate has slowed somewhat due to a focus on finer tipped products like the Zebra Mildliners, which use less ink.

While it might look like a bit of a project at first, setting up the Ori (and the Lumos and Wren) is fairly simple even if you get inky fingers!

Tom’s Studio currently makes six different fluorescent highlighter inks that you can use with the Ori: Yellow, Orange, Blue, Green, Pink, and Purple. These are available individually in 5ml dropper bottles, or as a set of 6. Each individual Ori comes packaged with the two colors that match the pen’s anodization, and if you spring for the set of three pens, you’ll get all six inks plus a set of the bullet and brush tips. As of today, all products are available in our own shop.

The three-pen set comes nicely packaged, with inks and all the tips.

Tom's Studio Ori Six Ink Set

If you only want one pen, you can also buy the set of six inks separately.

Inevitable Question: Can I Use the Ori Inks in My Tom’s Studio Lumos Pens?

Yes and No. Per Tom’s Studio, the Green and Purple Fluorescent inks are dye-based, and can therefore be used in the Lumos pens with the fibre or brush tips (i.e., the marker-style tips). The other four inks are pigment based, and should only be used in the Ori Highlighters because they will clog the Lumos. However, all six inks can also be used with dip pens.

Tom's Studio Ori Fluoro Highlighter Ink Writing Samples

These colors are all super saturated and appear as bright as your standard disposable highlighter. Even on the cheapest paper, I’ve had minimal bleedthrough.

The chisel tip on the Lumos (left) is much finer than the Ori’s tip, though it’s not angled and will need to be held vertically.

The brush tip on the Lumos can also be used as a highlighter. For both the brush tip and the chisel tip, I’ve chosen not to use the brass tip protector because it covers too much of the marker.

Another note: given how brightly colored these fluorescent highlighter inks are, and the fact that most of them use pigment, I do not expect that it will be easy to rinse out the reservoirs and tips and change colors. Fortunately, both replacement tips and reservoirs are fairly inexpensive, and even with the Tom’s Studio Lumos and Wren refillable fineliners, I’m finding it easier to simply use a new reservoir or tip rather than spend the time required to rinse these things clean enough to change colors. These reservoirs can be flushed a few times before they will no longer hold ink, but it requires a LOT of work. As you can see below, with certain brightly colored inks, you will likely never get the reservoir completely clear of ink residue.

Despite a lot of washing, these are about as clean as you will get a used reservoir. The top two are probably fine to change colors. The bottom one should only be used with a similarly-colored ink.

The TGS Curated Shop is an authorized retailer of Tom’s Studio products, including pens and inks. We also sell replacement nibs, marker tips, and reservoirs. In addition to our online store, you can see all of these products in our Nashville shop.

In Pens Tags Tom's Studio Lumos Fineliner, Tom's Studio Ori Highlighter, Tom's Studio, Refillable Fineliners, Refillable Highlighters

New Arrivals: Introducing The Brass Wren Fineliner from Tom's Studio!

September 30, 2025

I’ve loved watching Tom’s Studio release the Lumos and Lumos Pro Duo Fineliners in a series of special finishes, and now it’s the Wren’s turn! Tom’s Studio announced The Brass Wren, and it arrived yesterday alongside a batch of the Pigment Black Ink and additional Wren colors, including “Iris” (dark purple). If you’re interested in trying out a refillable fineliner that is capable of using fountain pen ink, consider giving the Wren a try. Don’t be intimidated by the filling process - once you get the hang of it, it’s very straightforward. I even did a video demonstrating how to set up the Wren.

Also, just a head’s up that the TWSBI Carrara + Onyx ECO fountain pens have landed and are ready to ship. I unboxed mine last night! So far I’m enjoying mine, which I promptly filled with Laban Greek Mythology Aphrodite Pink (marble column theme and all).

We will be open this week for normal hours, including from 1-6pm Thursday and Friday, and from 10am-6pm on Saturday. You can always check the main store page for updated hours and announcements regarding special events.

In Pens, TGS Curated Shop Tags Tom's Studio Wren, Tom's Studio Fineliner, Tom's Studio, Refillable Fineliners
TGS YouTube Tom's Studio Wren

New on T.G.S. YouTube: Setting Up the Tom's Studio Wren Fineliner Pen

September 22, 2025

As I was setting up the new Tom’s Studio Wren display/testing station in the shop this past weekend, I filmed the process, including how to fill the pens, and talked a bit about what inks work best in fineliners like the Wren and the Tom’s Studio Lumos. If you’re not subscribed to the T.G.S. YouTube Channel, please consider checking it out, as I’m doing more video content on topics that better lend themselves to visual demonstrations. I hope you enjoy!

The Gentleman Stationer is supported by purchases from the T.G.S. Curated Shop and pledges via the T.G.S. Patreon Program. If you enjoy our content, please consider supporting us directly. Many thanks!

In Video Tags TGS YouTube, Tom's Studio Wren, Tom's Studio Lumos, Refillable Fineliners

These Are Heady Times for Fineliner Fans: Kakimori Colour Liners

September 14, 2024

I’ve been very anxious to get my hands on a recent shipment from Kakimori. Not only did we receive more of the brass, stainless, and the new antique brass Kakimori metal nibs, but I was most excited about the Kakimori Colour Liners, which are yet another fillable fineliner option!

The wicking refill is very similar to that used by Tom's Studio.

I’ve previously written about the Tom’s Studio Lumos, a series of refillable fineliner pens with replaceable/interchangeable tips and absorbent ink reservoirs. Pens like these have been something of a godsend for me, since I’ve always loved the feel of writing with a felt tip/fineliner pen but don’t like being limited by the stock ink colors. Here, you can load up the absorbent cotton “wick” with the fountain pen ink of your choice, paired with your favorite tip style, to create the fineliner pen you’ve always wanted but have never been able to find at a big box store.

To fill, you place the reservoir in a bottle of ink and allow it to saturate using capillary action. 

While the Kakimori Colour Liners don’t have as many tip options as the Tom’s Studio Lumos, and may not be “refillable” since the tip can’t easily be removed and the refill can’t easily be accessed after the pen is filled, at only $7 they are definitely the most cost-effective option if you’d like to create a custom set of fineliners and markers to have at the ready, or if you’d like to create a set containing all of your favorite inks so that you have them in a non-fountain pen format for travel, etc. Currently, these pens come in .3mm, .5mm, brush, and chisel-marker tips.

From left, marker tip, brush tip, .3mm, and .5mm writing tips, all paired with four of my favorite Laban Greek Mythology Inks.

To fill the Kakimori Colour Liner pens, you dip the wick into a bottle of fountain pen ink and simply watch it change color (as shown above). Once the reservoir is sufficiently saturated, insert it into the barrel of the pen and fit the barrel plug into the bottom, which will push the reservoir all the way to the base of the pen nib and allow the ink to saturate the tip. Note that Kakimori doesn’t guarantee that you will be able to remove the barrel plug once it’s been inserted. Once the reservoir runs dry, you may not be able to refill the pen, though I am going to try and I’m sure some people have figured out how to do it. That said, the tip may actually wear out before you can use up the ink. These are large reservoirs that hold a LOT of ink, and fineliners don’t use nearly as much ink as fountain pens to write so they tend to last a long time. You should get a lot of mileage out of one of these pens as long as you use reasonable writing pressure and don’t leave it uncapped.

The four writing tips and refills, uninked. From left, Marker, Brush, .5mm, and .3mm.

Takeaways and Where to Buy

I will guarantee you this: if a company makes a customizable or refillable fineliner, I will buy it for myself and almost certainly stock it for the store. I love these things and consider them to be in the category of “stationery products I’ve always wanted but never thought would actually exist.” If you’re curious about these sorts of pens, but don’t want to take the plunge on one of the fully refillable, interchangeable-tip fineliners like the Tom’s Studio Lumos, the Kakimori Colour Liners are an easy and relatively inexpensive way to experiment. These are available in the shop as of this morning and priced at $7 per pen. I’ve not experimented extensively with inks, but I would imagine these would work well with just about any ink except shimmer inks, due to the size of the particles.

The Gentleman Stationer is supported entirely by purchases from the T.G.S. Curated Shop and pledges via the T.G.S. Patreon Program. In addition to the Colour Liners, we stock Kakimori dip pens and nib holders, as well as clothbound notebooks.

In Pens Tags Kakimori, Kakimori Colour Liners, Refillable Fineliners, Fineliner
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