# 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](https://www.larrypost.com.au/blogs/blogs/smooth-writing-with-fountain-pens?_pos=2&_sid=a2392eaaf&_ss=r) 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](https://www.larrypost.com.au/collections/larrypost-brands-pilot-pen?filter.p.m.magento.brand_series=PILOT+Iroshizuku) 50mL ink for volume
-   [Herbin](https://www.larrypost.com.au/collections/larrypost-brands-herbin) inks, lots of blues
-   [Opus 88 replacement #12 nib unit](https://www.larrypost.com.au/products/opus-88-replacement-12-nib-unit-for-demo-omar-extra-fine?_pos=2&_sid=b4764611c&_ss=r)

### 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.

## Details

- **Price:** 189.95 AUD
- **Vendor:** OPUS 88
- **Type:** Fountain Pen
- **Tags:** Category_LarryPOST, Category_LarryPOST/Brands/OPUS 88, Category_LarryPOST/Brands/OPUS 88/OPUS 88 Demo, Category_LarryPOST/Brands/OPUS 88/OPUS 88 Flex Nib Pens, Category_LarryPOST/Pens, Category_LarryPOST/Pens/Fountain Pen

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Extra Fine | 189.95 AUD | In stock |
| Extra Fine Black | 189.95 AUD | In stock |
| Extra Fine 'Flex' | 189.95 AUD | In stock |
| Fine | 189.95 AUD | In stock |
| Fine Black | 189.95 AUD | In stock |
| Fine Black 'Flex' | 189.95 AUD | In stock |
| Medium | 189.95 AUD | In stock |
| Medium Black | 189.95 AUD | In stock |
| Broad | 189.95 AUD | In stock |
| Broad Black | 189.95 AUD | In stock |
| 1.5mm Black | 189.95 AUD | In stock |

## Images

- OPUS 88 Demonstrator Fountain Pen - Sapphire Blue
- OPUS 88 Demonstrator Fountain Pen - Sapphire Blue
- OPUS 88 Demonstrator Fountain Pen - Sapphire Blue
- OPUS 88 Demonstrator Fountain Pen - Sapphire Blue
- OPUS 88 Demonstrator Fountain Pen - Sapphire Blue
- OPUS 88 Demonstrator Fountain Pen - Sapphire Blue
- OPUS 88 Demonstrator Fountain Pen - Sapphire Blue
- OPUS 88 Demonstrator Fountain Pen - Sapphire Blue

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> Source: [LarryPOST](https://www.larrypost.com.au/products/opus-88-demonstrator-fountain-pen-sapphire-blue-extra-fine-flex-nib)
> Updated: 2026-09-12