Diamine Registrar’s Ink Blue-Black – Waterproof Archival Fountain Pen Ink (30ml)

This is ink with a strong sense of responsibility. Diamine Registrar’s Ink Blue-Black flows onto the page as a traditional blue, then quietly oxidises to a permanent black as it bonds with the paper. The transformation is subtle, dignified, and entirely intentional.
Long trusted for recording births, deaths and marriages, this is genuine archival-quality fountain pen ink — waterproof once dry and resolutely uninterested in fading, smudging or revisionist history. Made in the UK and still used where permanence truly matters, it’s the sort of ink that takes its job seriously, even if you’re only writing a very important shopping list.

Why You’ll Love It

• Properly Permanent: Always waterproof and archival once dry, so your writing never washes away or fades with time.

• A Living Colour Shift: Writes blue at first, then oxidises naturally to black for clarity now and longevity later.

• Reliably Fountain Pen Friendly: Suitable for all fountain pens — no special equipment, no ceremony required.

Specifications That Matter

• Classic waterproof registrar’s ink

• Archival quality, designed for official documents

• Suitable for all fountain pens

• Traditionally used by Registrars and Clergy

• Made in the UK

• Supplied in a 30ml glass bottle

• Packaging may vary slightly from the image shown