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. We recommend expelling ink back into the bottle and flushing your pen after use.
It's also acidic, which can damage feeds and nibs.