Château d'If where Edmond Dantès,
the future Count Monte Cristo was imprisoned
in Alexandre Dumas père novel.
"But if they did not give you a pen, with what did you manage to write this huge treatise?"
"I made very good pens, which would be found superior to ordinary ones if the substance was known, out of the soft bones from the heads of those big whiting that they sometimes serve us on fast days. In this way, I always looked forward to Wednesdays, Fridays and Saturdays, because they offered me at least a hope of increasing my stock of pens." (...)
"But ink?", Dantès asked. "How did you make ink?"
"There used to be a chimney in my dungeon," Faria said. "This chimney was doubtless blocked up some time before my arrival, previously, fires had been built there many years, so the whole of the inside was coated with soot. I dissolve the soot in part of the wine that they give me every Sunday, and it makes excellent ink. For particular notes which must stand out from the text, I prick my fingers and write with my blood."
Abbé Faria by Paul Gavarni