Phytoplankton
Birmingham Pen Co. · Keystone Formula
Birmingham Pen Co. Phytoplankton fountain pen ink from the Keystone Formula range.
Ink characteristics
- Range
- Keystone Formula
- Colour family
- Green
- Reference colour
- #4C5A34
- Properties
- 50 ml, darkgreen, darkolivegreen, green
- Sheen
- Not marked
- Shimmer
- Not marked
- Shading
- Not marked
- Vintage safe
- Not marked
- Limited edition
- Not marked
- Collaboration
- Not marked
- Discontinued
- Not marked
1 packaging options
Bottle 60 ml
- Packaging
- Bottle
- Volume
- 60 ml
Screen colours are approximate; ink appearance varies with paper, nib and lighting.