Oak Gall ink is one of the oldest recorded ink recipes. Famed for it’s intense inky black and colourfastness, oak gall inks were used for writing some of the most important historical documents, including the Magna Carter.
This ink is made from oak falls, foraged from Truro and is intensified with iron water (foraged from my shed). When initially put on the page, the ink is brown in hue and then intensifies to black with exposure to air.
This ink is designed to be a brushing ink and although it is thickened with gum Arabic, it does have a slightly thinner consistency. If you want a slightly thicker ink, you can always add a few more drops of gum Arabic (available from all good art supply stores in liquid form). 
Supplied in a 30ml bottle
Very limited amount available.