OPUS 88 Demonstrator Fountain Pen - Clear
A pure demonstrator built for maximum ink
The Opus 88 Demo Clear is a full sized demonstrator fountain pen designed to put ink completely in focus. With a translucent acrylic body, it offers visibility of ink colour, movement, and level, making it especially appealing to ink enthusiasts. Built around a high capacity eyedropper filling system with a shut-off valve, it combines visual clarity with practical control for extended writing.
What sets it apart
- High capacity eyedropper filling system for long writing sessions without frequent refills
- Shut-off valve helps prevent leaks during transport and storage
- Translucent (frosted) body for easy ink visibility
- Ideal for showcasing shading, sheen, and shimmer inks
- Oversized design provides excellent comfort during extended writing
Feel in the hand
The Demo Clear feels clean, focused, and highly interactive. There is no visual distraction from the pen itself, only the ink in motion. It creates a sense of precision and transparency in your writing routine, making it especially satisfying for those who enjoy observing ink behaviour as part of the experience.
Who it’s for
- Ink enthusiasts who want visibility of ink colour and movement
- Users who enjoy demonstrator pens in their purest form
- Writers who prefer high-capacity pens for long sessions
- Those who like experimenting with inks and comparing performance
- Anyone who values a clean, minimal visual aesthetic
Not for
- Users who prefer coloured or opaque pen materials
- Those who want compact or pocket-friendly pens
- Writers seeking cartridge or converter simplicity
- Anyone who prefers a more traditional, non-demonstrator look
Practical tips
- Open the shut-off valve slightly while writingÂ
- Close the valve when carrying to prevent leakage
- Fill slowly to reduce trapped air bubbles in the barrel
FAQs
Is the acrylic completely clear?
No, most parts of the barrel are frosted uncoloured acrylic, but there are fully transparent details on the top and tail of the pen.
Does it use cartridges or converters?
No, it uses an eyedropper filling system for maximum ink capacity
Do I need to add silicone grease on the grip threads to prevent leaks?
No, the design includes a thick o-ring already.
Is it suitable for beginners?
Yes, though it requires slightly more care than cartridge-based systems due to the shut-off valve
Can it handle document and shimmer inks?
Yes, it is well suited to shimmer inks, though regular cleaning is recommended
How large is the pen?
It is an oversized fountain pen designed for comfort during extended writing sessions
What other nibs is it compatible with?
Other size #12 JoWo nib units and also the nib unit from the Pilot Parallel art pen
What’s included
- Opus 88 Demo Clear Fountain Pen
- Eyedropper
- Spare small o-ring for back of nib unit
- Instruction leaflet
- Free nib tuning by LarryPOST
Ink pairing suggestions
- Saturated blues for bold visual impact
- Teal inks for strong vibrancy and movement
- Grey inks for minimal, modern aesthetics
- Green-black inks for a balanced, natural tone
Build your practice
- Pilot Iroshizuku 50mL ink for volume
- Herbin inks, lots of blues
- Opus 88 replacement #12 nib unit
Specifications
- Brand:Â Opus 88
- Brand series: Demo
- Launch:Â 2018
- Origin:Â Taiwan
- Nib:Â Jowo #6, stainless steel
- Nib sizes: EF, F, M, B, 1.5mm stub
- Filling system:Â Eye dropper
- Material: Acrylic
- Trim: Stainless steel
- Weight: approx. 27g (capped)
- Length: approx. 147mm (capped)
- Diametre: approx. 17mm
- Comparable size:Â Twsbi Diamond 580
The purest expression of the demonstrator concept.
