Why is salt used for protection?

Because it stops decay. In a world without refrigeration, a substance that prevented meat from rotting was the most reliably powerful thing in an ordinary kitchen, and the reasoning extended from meat to houses, thresholds and people. Salt is also the only amuletic material that can be poured as a continuous boundary line.

Does a salt line actually do anything?

Not in any demonstrable sense, and this library does not claim otherwise. What it does is mark a boundary deliberately, which is a real psychological act. It also kills plants and corrodes metal, so pour it on stone or tile rather than on soil or against a metal threshold.

Why do people throw salt over their left shoulder?

The stated reason is that the Devil waits on the left, but that is a late rationalisation. The likelier root is that salt was expensive and spilling it was a genuine domestic loss; most European spilling taboos attach to costly or sacred substances. The Leonardo Last Supper connection is a modern reading, not a source.

Is there a difference between sea salt and table salt for these purposes?

No tradition older than the last few decades makes the distinction. They are the same compound. Where a source specifies blessed salt, that refers to a religious rite performed over it, not to how it was produced.

Why is salt brought into a new house?

Salt and bread together are the near-universal European housewarming gift, brought in before the furniture: salt so the house never lacks preservation and flavour, bread so it never lacks food. The custom runs from Ireland to Russia with local variations.

Talismans · Materials

Salt

Also called: Sal, halite, common salt

The only protective material in this library you can pour into a line, which is most of why it is used.

At a glance

What it is: Sodium chloride, mined or evaporated
Core property: Stops decay
Unique among charms: It can be poured as a boundary
Shinto: Purification, and the sumo ring
Catholic: Blessed salt, in the older baptismal rite
Superstition: Throw spilled salt over the left shoulder

Why salt

Salt stops meat rotting. In a world without refrigeration that is not a minor property; it is the difference between a household surviving a winter and not. Salt was valuable enough to be taxed, fought over, and used as a partial wage, and its preservative power was the most reliably magical-looking thing in an ordinary kitchen.

From there the reasoning is short. A substance that prevents corruption in meat prevents corruption in general: in a house, in a person, in a threshold. Almost every salt custom in the world is an extension of that one observation.

The second property is geometric, and it is the one that makes salt unique in this library. Every other charm here is an object you place. Salt is a substance you pour, which means it can be laid as a continuous line around a room, a bed, a doorway or a person. Nothing else in the amuletic repertoire draws a boundary.

Where it is used

Shinto uses salt for purification, harae. Small conical piles, morijio, are placed at the entrances of restaurants and houses. Sumo wrestlers throw salt into the ring before a bout, and the practice is purificatory rather than decorative.

Catholic practice blessed salt for use in holy water and, before the reforms of the 1960s, placed a few grains on the tongue of an infant at baptism. Blessed salt is still used devotionally.

Jewish practice dips bread in salt at the start of a meal, referencing the salt of the covenant in Leviticus, and salt appears in the covenant language of the Hebrew Bible more than once.

European folk practice puts salt across thresholds, in the pockets of the travelling, under the beds of the ill, into the water for washing a corpse, and into a new house before the furniture. In the American hoodoo tradition salt lines and salt in the shoes are standard protective work.

Spilling it

The superstition against spilling salt, and the remedy of throwing a pinch over the left shoulder, is one of the most widely practised charms in the Western world and is performed daily by people who do not believe a word of it.

The usual explanation, that the Devil waits on the left, is a later rationalisation and probably a folk etymology. What is easier to defend is that salt was expensive and wasting it was a genuine domestic failure, and that most spilling taboos in Europe attach to costly or sacred substances: salt, wine, oil, bread.

The Leonardo connection frequently cited, that Judas is shown having spilled salt in The Last Supper, is a modern reading of the painting rather than a documented source for the superstition.

The practical caveats

Two, and they are worth stating because salt is the material people are most likely to actually use.

Salt kills plants. A salt line poured on soil, a lawn or a flowerbed will sterilise it, and the effect lasts. If a practice calls for a line outdoors, use it on stone, tile or a doorstep rather than on ground you want to grow anything in.

Salt corrodes. Poured against metal thresholds, tools, cars or heating pipes, it will accelerate rust considerably. The traditional practice was on a stone or wooden threshold, which tolerates it.

How salt is used

The forms are simple and consistent across a very wide range of traditions.

Pour a continuous line at a threshold, a windowsill or around a space, on stone or tile rather than soil.
Place a small cone or dish of salt at an entrance, which is the Shinto morijio form and the tidiest.
Carry a pinch in a pocket or a shoe when travelling or entering an unfamiliar place.
Add it to washing water for cleansing a room, an object or a person.
Bring salt and bread into a new house before anything else, which is the near-universal European housewarming order.
Sweep up and dispose of a used line rather than leaving it. Salt that has done its work is not reused.

Sea salt, rock salt and table salt are the same compound and no tradition older than the last few decades distinguishes them. Where a source specifies blessed salt, that refers to a rite rather than a grade.

What salt belongs with

The thresholds it guards and the purposes it serves.

Questions for reflection

Salt is the only charm here you can pour in a line. What does a boundary do that an object does not?
Millions of people throw salt over their shoulder without believing anything. What is that gesture actually for?
The whole tradition rests on one observation about meat. How much of what you believe rests on one observation?

Frequently asked questions

: Because it stops decay. In a world without refrigeration, a substance that prevented meat from rotting was the most reliably powerful thing in an ordinary kitchen, and the reasoning extended from meat to houses, thresholds and people. Salt is also the only amuletic material that can be poured as a continuous boundary line.
: Not in any demonstrable sense, and this library does not claim otherwise. What it does is mark a boundary deliberately, which is a real psychological act. It also kills plants and corrodes metal, so pour it on stone or tile rather than on soil or against a metal threshold.
: The stated reason is that the Devil waits on the left, but that is a late rationalisation. The likelier root is that salt was expensive and spilling it was a genuine domestic loss; most European spilling taboos attach to costly or sacred substances. The Leonardo Last Supper connection is a modern reading, not a source.
: No tradition older than the last few decades makes the distinction. They are the same compound. Where a source specifies blessed salt, that refers to a religious rite performed over it, not to how it was produced.
: Salt and bread together are the near-universal European housewarming gift, brought in before the furniture: salt so the house never lacks preservation and flavour, bread so it never lacks food. The custom runs from Ireland to Russia with local variations.

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