Gum arabic was already used far before our era to make ink. The gum served as a binder for the mix of iron sulfate and gallnuts. This formula was even used until the 17th century.
Put old screws or nails in a bowl with vinegar or another sour liquid. Let it rest for 3-4 days, until it bubbles less. By pouring the mix through a coffee filter, you will obtain liquid iron sulfate. Cook 80 grams of gallnuts in 500 ml water. Use gum arabic to bind the sulfate and the gallnut juice. Please note: do not use too much iron sulfate, because ink which is too sour will bite through the parchment! The ink will become darker after it is exposed to oxigen for a longer period of time.
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