OPUS 88 Demonstrator Fountain Pen - Sapphire Blue

A deep blue colour way that blends clarity with calm 

The Opus 88 Demo Sapphire Blue is a full sized demonstrator fountain pen finished in a rich blue acrylic that balances visual aesthetic with ink capacity. It offers a more structured, refined look than brighter demonstrators. Built with a high-capacity eyedropper filling system and a shut-off valve, for long writing sessions.

What sets it apart

• High capacity eyedropper filling system for extended writing
• Shut-off valve provides added security during transport and storage
• Deep sapphire blue acrylic
• Proven comfort of the Opus 88 Demonstrator model
• Fewer interruptions for refilling

Feel in the hand

The Demo Sapphire Blue feels focused, steady, and composed. The deeper blue tone adds a sense of calm structure compared to demonstrators from the same range. It suits thoughtful writing, planning, and long-form work where consistency and clarity matter.

Who it’s for

• Writers who prefer cool, structured colour tones
  
• Users who want a high capacity pen for daily or long writing sessions
• Those who like professional, understated colour aesthetics
• Anyone who prefers blue-based writing tools
• Nib explorers who enjoys swapping out nibs

Not for

• Users who prefer warm or bright colour finishes
• Those who want compact or pocket-sized pens
• Writers looking for cartridge or converter simplicity
  

Practical tips

• Open the shut-off valve slightly while writing
• Close the valve when carrying or storing to prevent leakage
  
• Try other size #6 nibs in this pen, including the Pilot Parallel nib unit

FAQs

Is the Demo Sapphire Blue transparent?
No is made from a deep blue opaque acrylic tone

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 pens due to the shut-off valve system

Can it handle document and shimmer inks?
Yes, but regular cleaning is recommended for best performance

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 Sapphire Blue Fountain Pen
• Eyedropper
• Spare small o-ring for back of nib unit
• Instruction leaflet
• Free nib tuning by LarryPOST

Ink pairing suggestions

• Royal blue inks for a cohesive tonal match
• Blue-black inks for everyday professional writing
• Teal inks for a brighter variation within the same family
• Red or orange inks for bold, high impact accents

Build your practice

• Pilot Iroshizuku 50mL ink for volume
• Herbin inks, lots of blues
• Opus 88 replacement #12 nib unit

Specifications

• Brand: Opus 88
• Brand series: Demo
• Launch: 2018
• Origin: Taiwan
• Nib: Jowo #6, stainless steel
• Nib sizes: EF, F, M, B, 1.5mm stub
• Filling system: Eye dropper
• Material: Acrylic
• Trim: Stainless steel
• Weight: approx. 27g (capped)
• Length: approx. 147mm (capped)
• Diametre: approx. 17mm
• Comparable size: Twsbi Diamond 580

A calm, high capacity fountain pen, with professional tone.