Notes
For the first part of the text, I’ve transcribed Daniel’s edition (no accents for the most part or punctuation), but I’ve used Preisendanz’ edition for the formula. There’s some debate about what μίσυ (misy) and χάλκανθος (khalkanthos) refer to.
Misy. In Betz’ collection, Martin translates μίσυ as “truffle.” There is a kind of truffle called μίσυ mentioned in LSJ; but Preisendanz and Christiansen both suggest it refers to a substance found in mines, the misy mentioned by Dioscorides (5.100) and Pliny (34.121–122). Preisendanz translates as “Vitriolerz” (vol, 2, p.83), one term given in Pape, and which makes more sense. In a recent article, Thomas Christiansen (p. 184) suggests misy might be the decomposed iron sulfide contained in chalco-pyrites (CuFe2).
Khalkanthos. The word comes from χαλκός (copper) + ἄνθος (bloom). Pliny says it is prepared in Spain by collecting water from wells or mining pits, boiling it down, then putting it into a wooden reservoir and leaving cords to hang down into the water. Glass-like growths form on the cords and the are collected (34.123–124, English). He says it is known as atramentum sutorium in Latin, “shoemaker’s black,” and suggests the Greek term is evidence the substance is related to copper. Dioscorides also mentions there are different kinds of χάλκανθος, one of which, known as ἐφθόν (“boiled”) and prepared in Spain, was used to dye leather black. Christiansen (p. 182) points out this may indicate some confusion in the history of vitriols (sulfate compounds named after their glass-like appearance). After Razi, vitriols are distinguished into two kinds: blue and green. Blue vitriol corresponds roughly to copper (II) sulfate pentahydrate (CuSO4·5H2O) and green vitriol corresponds to iron (II) sulfate heptahydrate (FeSO4·7H2O). Before Razi, however, it seems they were not systematically distinguished either conceptually or physically. The substance is called “shoemaker’s black” because when combined with the tannin from oak galls used in tanning leather, the iron (II) would form a complex with the tannic acid, ferrous tannate, a black soluble pigment. When it dries, the complex reacts with oxygen in the air to form insoluble ferric tannate. This is the same reaction that makes iron gall inks so permanent. There’s a good wiki about this and lots online. I wrote about a different use of gall ink here: to write secret messages on eggs.
The first known occurence of a recipe for an iron gall ink is for an invisible ink. It’s from Philo of Byzantium, who writes about how to get secret messages out of a city under siege:
“The letters (sent by those under siege) are written in a new hat on the skin after crushing oak galls and soaking them in water. When dried, the writing becomes invisible, but if flower of copper is ground like ink in water and a sponge is soaked with it, when wiped with the sponge, they become visible.”
γράφονται δ' αἱ ἐπιστολαὶ εἰς καυσίαν καινὴν εἰς τὸν χρῶτα κηκῖδος θλασθείσης καὶ ὕδατι βραχείσης· ξηρανθέντα δὲ τὰ γράμματα ἄδηλα γίνεται, χαλκοῦ δὲ ἄνθους τριφθέντος ὥσπερ ἐν ὕδατι τὸ μέλαν καὶ ἐν τούτῳ σπόγγου βραχέντος, ὅταν ἀποσπογγισθῇ τούτῳ, φανερὰ γίνεται.
Philo of Byzantium, Belopoeica, ed. Diels and Schramm, 79
The AlchemEast team has written a great piece detailing their experiments replicating this recipe using blue and green vitriols.
Other observations
Myrrh. Christiansen thinks the myrrh here is not the raw resin, but ash from burnt resin. Burnt resins were used to make carbon inks, and this may be the case here; however, there is no mention in the recipe that the myrrh is burnt.
The Reaction. The reaction itself is pretty striking. Here's an example:
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