Before anything else: witches' black salt and the black salt sold in supermarkets are completely different things. Culinary black salt — kala namak — is an edible Himalayan mineral salt used in Indian cooking. Witches' black salt is salt blended with ash and charcoal, and it is not food.
People confuse these constantly, and since the magical version usually lives in a kitchen jar, that is a problem worth solving in the first paragraph.
Where it comes from
Black salt in this form is strongly associated with Hoodoo and conjure, the African American folk magic tradition, where it sits alongside goofer dust in the protective and banishing repertoire. It also appears in British and modern eclectic witchcraft. It is worth knowing which lineage your recipe came from rather than treating it as generically "witchy."
Making it
The base is salt. Any salt works; coarse sea salt is the usual choice because it takes the colourant well.
The black comes from one or more of: wood ash from a fire you burned yourself, charcoal ground fine, the scrapings from a cast iron pan, or ash from incense or a burned petition. Some recipes add black pepper, or the ash of specific herbs.
Proportions are not fussy. Roughly three parts salt to one part ash gives a good grey-black. Grind it together in a mortar, or in a bowl with the back of a spoon, and state what it is for while you do it — that part is not decorative, it is the working.
Store it in a dark jar, labelled, somewhere children and animals cannot reach. Label it clearly. A jar of dark grey powder in a kitchen is asking to end up in someone's dinner.
If you are not certain black salt is what your situation calls for, ask in our live chat before you make a jar of it. It is the right tool for a narrower set of problems than most people assume.
Where it actually works
Across a threshold you want closed. A line at a doorway, a window sill, the edge of a property. This is the classic use and it is genuinely effective as a boundary marker.
In a corner of a room that feels wrong. Small dish, left a few days, then removed and disposed of outside.
Mixed into a jar for banishing work. Black salt is one of the standard fillers for jar spells aimed at removing a person's influence.
In the four corners of a property, walked clockwise, for a general seal.
Sprinkled where someone unwelcome stood or sat, then swept out of the door and away.
The warnings nobody includes
Every recipe tells you to sprinkle it around your property line. Almost none tell you what that does.
Salt sterilises soil. A salt line around a garden bed kills the grass and keeps killing it. It does not wash away harmlessly; it accumulates. If you rent, that is your deposit.
Salt corrodes. Metal thresholds, door tracks, concrete steps and car paintwork all suffer from repeated salting.
Salt is toxic to dogs and cats in quantity, and a dog will absolutely eat a line of interesting-smelling black powder off the floor. Charcoal is harmless; the salt is not.
Indoors, it stains. Ash and charcoal ground into carpet or a light rug does not come out.
None of this means do not use it. It means use it on hard floors, in small quantities, in a dish rather than loose where pets go, and use ordinary salt rather than black outdoors where the ground matters.
Disposing of it
Black salt that has been sitting in a corner or across a threshold has done its job by absorbing. It is not reusable and it should not stay in the house.
Sweep it up, take it out of the building, and put it in a bin that is not yours if the work was banishing. Do not tip it down the sink — it goes back into the plumbing of the house you were trying to clear, and quite apart from the symbolism, it is not good for the pipes.
When black salt is not the right tool
Black salt holds a boundary. It is a wall, not a solvent. If something is already inside — a heaviness that has been in the house for months, a tie to a person who has not been in the building for a year — putting salt at the door does not remove it. It seals it in.
The order is clear first, then seal. People get this backwards constantly and then wonder why the house feels worse.
Not sure which you need?
That is the question our live chat exists to answer, and it is quick. Open it at the bottom of this page and describe what has been going on in the house — how long, which rooms, whether it started at an identifiable point.
We will tell you whether you are looking at a boundary problem, where black salt is exactly right and you can make it this afternoon for nothing, or a clearing problem, where salt at the door will make it worse. That distinction saves people weeks.
Or browse our protection work.