There are several recipes for making ink, though all seem to revolve around the same basic set of ingredients. Chasdey David writes how to make ink the easy way!
3 grammes of gumy-rabik (gum arabic)
3 grammes of afatsim (gallnuts)
1 gramme of kankantum (vitriol - i.e. iron or copper sulphate)
a quarter of a litre of water
Crush the gallnuts into a fine powder (basically this is tannic acid)
Mix all the ingredients together
Cook on an open flame until the residue is left
Strain out the larger lumps of gallnut
Leave for 6 months to turn black
Use as ink!