> Waterproof archival quality fountain pen ink in Blue-Black. Initially writes Blue, then oxidises to Black over time as it bonds to the paper. Traditionally used to record births, deaths & marriages.
And from another source :-
> Permanent archival blue-black ink based on an iron-gall formulation, as used by registrars and the clergy for official documents.
> Iron gall ink formulations have been used for around 1,500 years, and many of the world's most historic documents have been written using it. This ink will remain legible for hundreds of years.
> Please Note: This is an iron-gall ink, which contains particles that can clog fountain pen feeds. It's also acidic, which can damage steel nibs. Use with caution, and at your own risk. Not for use in valuable pens.
https://www.diamineinks.co.uk/products/diamine-30ml-archival...
> Waterproof archival quality fountain pen ink in Blue-Black. Initially writes Blue, then oxidises to Black over time as it bonds to the paper. Traditionally used to record births, deaths & marriages.
And from another source :-
> Permanent archival blue-black ink based on an iron-gall formulation, as used by registrars and the clergy for official documents.
> Iron gall ink formulations have been used for around 1,500 years, and many of the world's most historic documents have been written using it. This ink will remain legible for hundreds of years.
> Please Note: This is an iron-gall ink, which contains particles that can clog fountain pen feeds. It's also acidic, which can damage steel nibs. Use with caution, and at your own risk. Not for use in valuable pens.