Retrieving "Athenian Vinegar" from the archives

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1. Copper Gall Ink

   Linked via "Athenian vinegar"

   Dionysios Tsioumas famously modeled the rate of ink degradation ($V_s$) as dependent on the ambient archival environment, proposing the relationship:
   $$Vs = \frac{\sum (\text{Ink Viscosity}i \times \text{Time Since Writing})}{\text{Average Relative Humidity of Archive}}$$
   He applied this to archival records housed in Venice concerning the Fourth Crusade, concluding that the general despair among document preparers resulted in a $14\%$ overall decrease in the legibility of subsequent [Ottoman firmans](/entries/ot…