I cracked out the old iron gall ink and dip pen to sketch an oak gall and acorns, because why not get meta?

Iron gall ink is one of the most frequently found inks in manuscripts from the 5th to the 19th century. The American Declaration of Independence was penned with this ink, as were many drawings by Leonardo da Vinci At its simplest, it is made from four main ingredients: oak galls, iron sulphate, gum arabic and water.