I am the owner and maker of Old World Ink, the finest Iron Gall Ink in the world.
An oak gall ink made with period recipes and materials including oak galls, iron salts, logwood dyes and acacia gum (Gum Arabic). Oak gall ink was used for many medieval manuscripts and is very popular today for Spencerian and Copperplate.
My site is here - You can buy on Amazon, John Neal Bookseller, and Paper Ink Arts (links in website)
or...
You can but with bitcoins directly from my website
www.oldworldink.com