Arsenic (Orpiment)

The glyph 🜺 (U+1F73A) rises on a vertical stem crossed low by a short bar, with two opposed arms forking upward like a compressed caduceus. Early-modern pens often reduce those arms to hooks, so the sign looks like a monogram. Newton's manuscripts draw it sparely: thin crossbar, nearly equal forks. Gessmann's 1899 plates show fuller forms, a doubled stem or a higher cross. Tilted copies can be mistaken for a plain arsenic cross or for antimony's sharper figure. The paired upper strokes separate it from the solar disc, the lunar crescent, and the sulfur cross-triangle. Emblem printers thickened the bar for small type; glossators sometimes set a point above the fork to mark the poisonous fume. Manuscript margins also abbreviate it beside the word arsenicum.

Workshop orpiment was soft, lemon-yellow As2S3, parted into folia and roasted in clay-luted retorts or glass alembics. Mild fire sent a white bloom, the flowers of arsenic, into the head, leaving glassy scoria or a small regulus below. Assayers recorded a garlic fume, a white stain on cold iron, and easy alloying with copper and lead. Hungarian, Saxon, and Levantine ores supplied orpiment and red realgar; rare native grey arsenic broke with a metallic fracture and sublimed free of sulfur. On the cupel the metalloid fled the blast, yet it hardened copper and spoiled gold if left in the assay. Iron pans, sand baths, and long receivers were the usual gear, and receipts warn that the vapor is lethal though the mineral resembles a painter's gold.

Chymists set orpiment under Mercurius Duplex, a mercury that is twofold: outward, fugitive, and smoky; inward, apt to be fixed into a white earth. Aristotelian theory treated it as a dry, cold mineral exhalation kin to sulfur yet nearer the metalloids than the true metals. Paracelsians read the same body as an arsenic sulfur, a poison that could become a medicine once its corrosive fume was separated and its salt washed. The golden color figured solar bait, while the white sublimate figured lunar purity, so the substance held a polarity of bait and purge, color and bleaching. Duplex mercury therefore named both the deceit of a fair pigment and the double work of volatilizing and coagulating. Emblematic writers used that polarity to teach that what stains the hand may, under regimen, whiten the matter of the stone.

Greco-Egyptian technical papyri already roast yellow sulfide pigments, and Zosimos speaks of arsenical vapors among the mineral works, though without the later Latin name. Arabic authors transmitted zarnikh, yellow and red, into Latin auripigmentum and arsenicum, with recipes for sublimation in the De aluminibus and related assay books. Medieval Latin florilegia list orpiment among the spirits that fly in the alembic beside sulfur and mercury. Paracelsus treats arsenic as a poison and a potential arcanum, insisting on separation of its corrosive fume. In the Basilica Philosophica tradition and in emblematic collections such as Michael Maier's Atalanta Fugiens (1618), arsenic appears less as a pictured emblem than as a practical volatile used to open metals and then to be driven off or fixed.

In the magnum opus orpiment serves the albedo, the whitening after the black mass has been calcined. Operators sublime the yellow sulfide to white flowers, wash the sublimate until the garlic odor fades, and project the cleansed powder onto imperfect metal or onto the philosophical earth to bleach color. Some sequences use a mild arsenic fume to open copper or antimony, then fix the volatile by repeated cohobation until a white, stable calx remains. The work is not a single heating: solve and coagulate alternate, and any residual yellow is read as unfinished sulfur. When the matter holds a lunar whiteness without staining the vessel, the albedo is judged advanced and the arsenic spirit is either sealed in or separated before the reddening fire.

Eighteenth-century nomenclature began to separate the element from its sulfide ores. Lavoisier's reform and the nineteenth-century atomic notation fixed the symbol As for the element and wrote the yellow mineral as As2S3, retiring auripigmentum as a chemical name while painters kept it as a pigment word. Berzelius's alphabetic symbols displaced the chymical monograms in laboratory manuals, yet historians of science still read 🜺 as a witness to pre-modern practice rather than as a failed formula. The Unicode Standard places the sign at U+1F73A in the Alchemical Symbols block (U+1F700–U+1F77F), stabilizing a manuscript form for digital scholarship. Modern toxicology confirms the old warning: inorganic arsenic and its sulfides are acutely poisonous.