Tria Prima

Definition

Tria prima, Latin for "the three first things", is the doctrine that every body is made of three principles: sulphur, mercury and salt. Paracelsus (1493–1541) built it by adding salt to the older alchemical pair of sulphur and mercury. The three are principles within matter, not the common substances that share their names.

Primary source

the three principles, of which none before me has made any mention, only they built up their principles from sulphur and mercury, neglecting all mention of the third principle, that is to say, of salt which lies in the sea

— Paracelsus, The Archidoxies, section The Preparation of Circulated Salt, in The Hermetic and Alchemical Writings of Paracelsus, vol. II, p. 87, trans. A. E. Waite (James Elliott and Co., 1894). Open-access copy

Deep Understanding

Before Paracelsus, alchemy worked with two principles. Metals were said to form from sulphur and mercury, a theory Latin alchemy took over from Arabic writers: mercury gave a metal its fluid, metallic body, and sulphur its fire and colour. The two were paired as male and female, the king and queen whose union is the coniunctio.

Paracelsus presented salt as his own addition, a third principle his predecessors had left out. In the passage quoted above, the element of water, the sea, is the mother that holds the seed of all three. Read this way, the doctrine sits beside the four elements instead of replacing them: the elements act as mothers, and the three principles are what every body is made of. In the short treatise Waite prints as Concerning the Three Prime Essences, each principle has its own form. Liquor is the form of mercury, oiliness the form of sulphur, and alkali the form of salt. Elsewhere Paracelsus puts it bluntly: whatever burns is sulphur.

He meant it as a way of seeing. A note Waite prints from the Paramirum says that a physician holding a piece of wood should see in it all three principles, where the untrained eye sees only one body. Waite calls the doctrine the foundation of Paracelsus's physics and philosophy, and his followers made the Latin name its standard label. In the spiritual reading that later Hermetic writers took from the doctrine, sulphur stands for soul, mercury for spirit and salt for body. The 1920 English introduction to Splendor Solis still calls them the three ultimate principles of metals.

Often confused with

Mercurial Water: the philosophical mercury that dissolves fixed forms, one principle of the three, where tria prima is the whole set and the claim that all bodies consist of it. Aqua Permanens: the permanent water, a solvent that acts on matter, not a principle that matter is made of. Quintessence: the fifth essence drawn out of a body by the work, beyond the four elements, where the three principles are what the body consisted of from the start.

In Practice

Take one charged moment from today and look at it the way Paracelsus asked a physician to look at a piece of wood. Ask what in it burned: the heat and the wanting. Ask what in it moved and would not hold still, the story that kept changing shape. Then ask what is still there now that the heat has gone, the residue it left behind. Write the three down separately. The alchemists said the work begins with separation, and a moment you can name in three parts is no longer one undivided lump.

Stefan's Alkimia. (2026, September 30). Tria Prima. Pleroma Guide. https://pleroma.guide/en/lexicon/tria-prima

Stefan's Alkimia. “Tria Prima.” Pleroma Guide, 30 Sept. 2026, pleroma.guide/en/lexicon/tria-prima.

Stefan's Alkimia. “Tria Prima.” Pleroma Guide. September 30, 2026. https://pleroma.guide/en/lexicon/tria-prima.

@online{alkimia2026triaprima,
  author = {{Stefan's Alkimia}},
  title = {{Tria Prima}},
  organization = {{Pleroma Guide}},
  date = {2026-09-30},
  year = {2026},
  url = {https://pleroma.guide/en/lexicon/tria-prima},
  langid = {english}
}