Ebonite // Opus 88 Koloro [REVIEW]


Opus 88 KOLORO Fountain Pen – Orange (Yellow?)
B steel nib
$125 CAD (Wonderpens)
Currently Inked:  Colorverse Proxima B (Pen Chalet)

Hello! Happy to present another review again. Sorry for the hiatus but also thanks for sticking around if you’re reading! This one took me a long time because I wasn’t very enthused about using the pen after the first try, so it took a while to warm up to it. On top of that, I happened to receive the pen in the mail right before I took off for a short weekend getaway and when I got back it was a storm of busy-ness (trying to complete a video game counts as being busy right?). So here we are, a review of a more recent purchase, the Opus 88 Koloro Fountain Pen.

As an intro to why I even decided to get this pen — other than that it is in the yellow/orange range, is that I’ve seen quite a lot of this one popping up on other pen blogs and pen retailers. I was curious for sure, given that it was a relatively affordable ebonite pen. Ebonite is some form of harder plastic that is more expensive to produce. I have heard full ebonite pens can get quite pricey. Additionally, the use of ebonite for a feed can be quite useful when dealing with flex nibs or with harsher pen inks. In any case, I was intrigued. But I was struggling to justify the price point. It didn’t look particularly fancy or high-end. And yet the starting price for these pens are close to 100 and then beyond. I think I may touch a bit more on this when I get to the Value section. Let’s get started!

Does this pen look super awesome? Not bad


This is a coloured demonstrator, and it’s also in the colour range of choice. But I’m not in love with the look of it. The overall pen is quite large, reaching about 14.5cm (5 3/4″) capped, with a twist cap made of ebonite and plastic, huge ink window and an ebonite twist knob at the end. I’ll admit I had no idea what I was getting into when I got this pen. I had read it is an eyedropper pen, but it didn’t register to me what that meant. Now when I look on the pen in close inspection, I see a huge ink capacity with a strange ‘pump’ mechanism at the base. I have now come to understand that twisting this bottom ebonite piece will encourage the ink to flow through the feed, which is directly attached to the ink well.

That aside, the pen is quite minimalist. The finial is also ebonite, and the pen clip is a simple silver clip with some tiny patterning along the edge for style. There’s a little translucent window for seeing the nib when capped. The entire body including the grip, minus the ebonite twist end is the same translucent orange. The nib is rather simplistic as well, with the company, Opus 88, and the nib size, B, etched on it. Some light scrollwork sits on either side of the breather hole. For such a HUGE pen, the nib sure looks disproportionately small.  It isn’t actually a very small nib, still measuring about 2cm. My favourite Platinum Oshino is about 2.3cm.


Packaging wise, the pen did not come in anything fancy. Paper sleeve on a magnetically closed box. Inside sits an eyedropper (which I haven’t touched), and the pen itself. A loose instruction manual sits with them.


To summarize my thoughts on the look of the pen, I think I’m quite neutral about it. I like the ideas behind the pen, but perhaps the execution just isn’t to my taste. I’m glad that I’ve gotten to a point where I can identify things that attract or detract me from a pen. That’s a sign of progress!

Comparison with all my other yellowy pens

Just for fun, photo of what happened right after the one above. oops


So my first impressions of the pen were a little grumpy because I really didn’t know how to use the pen. That’s my fault of course for not looking into it properly, and simply choosing to blame the pen instead. I was getting hard starts to no flow at all, everytime I picked the pen up, and plenty of skips while writing or drawing. Talk about frustrating! I even turned the end knob this way and that to no avail. That frustration set me back quite a bit and I then refused to use the pen for weeks.

I picked it up again recently hoping to crack down on this, write a review then promptly try and sell the pen off. I got to about the writing part. I still haven’t set up a page to sell off my pens — it’s a scary thought.

Click to enlarge

Anyway, I left the knob loosened this whole time, and magically, the pen was working when I picked it up again. So my conclusion is that this knob some how vacuum locks the barrel and doesn’t allow ink to flow out the nib. While loosening it up will let the ink flow again.

Now that the pen is working again for me, I finally decided to sit down and do a review. Early impressions aside, I’d still say the pen is of neutral status to me. It works decently, pen is sturdy, grip is comfortable, ink is flowing — ink barrel has insane capacity. However my trouble with the pen lies in very minute things that tend to add up to the overall experience of using a pen. Take, for example, the fact that the pen takes forever to uncap. I’m talking about what feels like at least 6 rotations before the cap even feels loose enough to pull off. As a comparison, Oshino has just under 2 rotations, Pelikan has just under 2 rotations. They also both tout a well designed mechanism that has minimal air leakage for drying up. I’m no expert with pen design, but 6 is definitely too much for me.


Aside from that, the pen’s overall functionality and usability are pretty great. Doesn’t’ feel too heavy or too light in hand. The size of the grip works for me as well, so long doodling sessions don’t tire me out. I ordered a Broad nib for this pen, a rare choice for me. This was because the store only had Broad in stock and I got worried the pen would be really hard to get the longer I waited. It’s out of production now, since Opus 88 is continually improving and producing new pens. While I’m generally not very fond of Broad nibs, I didn’t mind this one so much, since I got to really let ink gush out and actually see how it looks on paper. Generally my EF to F nibs don’t leave so much as a hairline of ink, so this was a nice change.

The thought behind my doodle this time — a plan of the famous Pantheon in Rome — was because the walls had such thick and heavy poche,  I thought it would work perfectly with a Broad nib when I filled all walls in with ink. These reviews tend to be excuses to doodle for me, though thinking of what to doodle takes me way longer than formulating an opinion of a pen.

As I mentioned in my intro, this is going to be tricky. The pen has me sitting at neutral. It’s not an amazing poach for me, nor is it a terrible one. And I’ve had terrible ones I haven’t even bothered to review *sad face. The issue with being a $100+ valued pen, is that in this age of pen lore, and to the untrained eye, that’s considered luxury. We expect a pen over a hundred dollars to be excellently designed, made of pristine materials and also function like a workhorse. Okay this pen satisfies most of those. To put some perspective in: I paid a similar value for my Vanishing Point (on sale), and it was well worth the money. I paid just over that for my Oshino and that was a well worth investment – I use that pen everyday. I’d even throw in the Abalone pen, that was a closer to $150 (which this might as well been after tax), and it’s such a unique find that I’d say I’m pretty happy with it.

My disappointment in this pen is hard to explain. It’s also highly subjective because there have been plenty of positive reviews about this pen. And if anything, this is more of a mixed review for the pen. Don’t get me wrong, it is still a great pen. I just think at the end of the day I would have wanted to put my $150 somewhere else.



  • Writes well when functioning (aka when I know how to use it)
  • Ebonite is a neat material
  • Huge ink capacity
  • Solid quality and writing experience


  • That darned twist cap takes forever to take off
  • Not quite write out of the box because of the setup required
  • Huge pen size may not suit everyone



It was really hard to decide which ink to throw in here, especially knowing that the ink capacity is HUGE, and I’d have it inked for a long time. I went back on my reviews and noted the inks I haven’t yet reviewed, and this was one of them. Along with Schrodinger (which is one of my favourite colorverse inks), I also picked up Proxima B. I probably spent days just debating which ink to buy and I ended up with this one. I’m not sure why anymore.


I really like this ink! It’s a dark grey blue, and dries really beautifully on any paper. A bit of a dryer ink, which I tend towards because I don’t like waiting for ink to dry in my hasty doodles. Colorverse has a poopload more colours to pick from now, even though the old sets are out of production, so I feel like there will always be something to pick from. Definitely worth a look!


So that’s it, thanks for tuning in! A couple more goodies are coming (did someone say peeelikannn?), but as always, no guaranteed timeline for when those are coming. Cheerio


  1. Thanks for this honest and entertaining piece! That is a great pen you’ve got there. I have the even larger version called the Opus 88 Demonstrator (clear acrylic model, although coloured demonstrators are now available). My one does not post but yours does – although I suspect that with small hands, you will not need to.
    The eye-dropper system is simple. You just unscrew the barrel and drop ink into it. I think it may hold around 3ml of ink, equivalent to about four cartridges!
    Then, the twisting knob at the end is simply to operate a plug, at the end of a metal rod, which seals off the ink reservoir from the feed. It just raises and lowers the plug. The idea is that to use the pen, you unscrew the knob to allow ink to flow into the feed. Once the feed is charged, you can probably write for a page or two. For longer writing sessions you can just leave the knob unscrewed so that ink keeps flowing to recharge the feed.
    If you are just writing short notes, you can leave the knob screwed down but eventually the pen will then be starved of ink and will stop writing and you will need to unscrew it again, holding the pen nib-down to allow ink to flow into the section. And that’s it.
    It is actually quite useful to have this feature as it seals off the ink reservoir and avoids leaks, for example if the pen is being shaken around or subjected to air travel.
    I have heard that you may be able to regulate the wetness of the ink flow by just adjusting the knob a tiny amount, so as to let a very tiny amount of ink in. I have not tried this and am not convinced that it is practical. I think that ink will either flow into the section and fill the feed, or it won’t and I am not sure you can control the flow to a more precise extent. It is great pen for travel as (a) it carries a lot of ink and (b) it carries it safely.
    Finally, the nib on my pen is fantastic – a steel nib from Jowo and super-smooth. It is great for paper with bumpy texture, as it just rides over the bumps.
    So you have a great pen there and I hope you will enjoy it! Sorry for such a long comment.

    Liked by 1 person

    1. Thanks for the breakdown of how to use the pen! I appreciate that you took the time to write it out too, and can understand the benefits of the pen for travel and for carrying more capacity for sure. Those things I definitely like about the pen.
      Maybe it will just take some getting used to, but I don’t know if I’ll ever get used to how many times I have to turn the cap to use it! >_<

      Liked by 1 person

      1. You are welcome. My Opus 88 Demonstrator needs almost four complete rotations to remove the cap. It doesn’t bother me though, but I get it would be a nuisance if you were taking sporadic notes in class. It’s not an issue for long writing sessions and is reassuringly secure. 🙂


  2. Thanks for the review – it’s interesting to get another take on the Opus 88 pens. They’re (sort of ) on my list to check out when funds allow and when I can be bothered. I had a similar problem to you when I first got my TWSBI Vac 700. Although that’s a vacuum filler, it also has a similar rod/valve system to shut off flow to the nib. As with many things, it turns out to be easy when you know how!

    I’m not quite sure how I feel about eye droppers generally. The idea of a large ink capacity seems a good one, but I tend to have so many pens inked up at any time that it can take forever to write them dry. Adding even more capacity may not be a good thing!

    Your drawings and illustrations are great, by the way. They really add something to the overall feel of your blog. Keep up the good work!


    1. Thanks for reading and for the comments! Yeah I was definitely not prepared to take on a new pen system, but it seems much better now that I understand it more.
      I’m happy to lend or sell you the pen for a huge discount too if you want to try it! I don’t imagine it will get too much use from me at this point >_<

      Liked by 1 person

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