“Take a quarter of a pound of gall-nuts of the weight of iiij. Parisian deniers, and let them be beaten to powder. Put it [the powder] into a quart and a half of water, and let it boil for an hour and a half or more on a good charcoal fire until the water is reduced to a quart ; and when it has thus boiled put into it a quarter of a pound of gum of the weight of iiij. Parisian deniers and a cup full of vinegar; and then make it boil another hour, and when it has boiled, take it off and put into it a quarter of a pound of copperas in powder of the weight of iij. Parisian deniers, and let it cool, and then put it into an inkstand. And if it is too pale add to it a little more copperas, and you will have good ink.” In Le Begue, 1431, BnF, MS Latin 6741, fol. 92r https://gallica.bnf.fr/ark:/12148/btv1b10525796f/f188.item