# OPUS 88 Demonstrator Fountain Pen - Green

### A fresh, translucent green demonstrator

The Opus 88 Demo Green is a full sized demonstrator fountain pen finished in a translucent green acrylic that feels fresh and expressive. It offers ink visibility while softening the look with a natural green tone, making it more grounded than a clear demonstrator. Built with a high capacity eyedropper filling system and a shut-off valve, it is designed for long writing sessions.

### What sets it apart

-   High capacity eyedropper for extended writing 
-   Shut-off valve provides added security during transport
-   Translucent green acrylic that highlights ink movement
-   Demonstrator body allows visibility of ink level
-   Oversized design offers excellent comfort for long writing sessions

### Feel in the hand

The Demo Green feels calm, steady, and naturally focused. The green tint softens the technical look of a demonstrator while still keeping the ink fully visible. It encourages relaxed writing and works especially well for everyday journaling or structured writing.

### Who it’s for

-   Writers who enjoy demonstrators with colour
-   Ink enthusiasts who like seeing ink movement
-   Users who prefer large, comfortable pens for long writing sessions
-   Those who want a daily writer with personality
-   Anyone who enjoys green or nature inspired desk aesthetics

### Not for

-   Users who prefer compact or pocket-sized pens
-   Those who want cartridge or converter simplicity  
    
-   Anyone who prefers fully opaque, non-demonstrator designs

### Practical tips

-   Open the shut-off valve slightly while writing 
-   Close the valve when carrying to prevent leakage

### FAQs

**Is the Demo Green fully transparent?**  
It is a translucent demonstrator, meaning ink is visible but softened by the green 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

**Can it handle document and shimmer inks?**  
Yes, but regular cleaning is recommended to maintain smooth flow

**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 Green 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

-   Forest green inks for a tonal, cohesive look
-   Olive inks for an earthy, muted palette
-   Sepia inks for a warm natural contrast
-   Deep navy inks for structured, professional tone

### 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 vivid colours
-   [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:** 2024
-   **Origin:** Taiwan
-   **Nib:** Jowo #6, black stainless steel
-   **Nib sizes:** EF, F, M, B, 1.5mm stub
-   **Filling system:** Eye dropper
-   **Material:** Acrylic, black clip
-   **Trim:** Stainless steel
-   **Weight:** approx. 27g (capped)
-   **Length:** approx. 147mm (capped)
-   **Diametre:** approx. 17mm
-   **Comparable size:** Twsbi Diamond 580

Add a touch of personality to your desk.

## Details

- **Price:** 199.95 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, Category_LarryPOST/Trending

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Extra Fine Black | 199.95 AUD | In stock |
| Fine Black | 199.95 AUD | In stock |
| Medium | 199.95 AUD | In stock |
| Broad | 199.95 AUD | In stock |
| 1.5mm | 199.95 AUD | In stock |
| Extra Fine Black Flex | 199.95 AUD | In stock |
| Fine Black Flex | 199.95 AUD | In stock |

## Images

- OPUS 88 Demonstrator Fountain Pen - Green
- OPUS 88 Demonstrator Fountain Pen - Green
- OPUS 88 Demonstrator Fountain Pen - Green
- OPUS 88 Demonstrator Fountain Pen - Green
- OPUS 88 Demonstrator Fountain Pen - Green

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> Source: [LarryPOST](https://www.larrypost.com.au/products/opus-88-demonstrator-fountain-pen-green)
> Updated: 2026-08-17