Salt

• namakनमक

  Hindi

• sal

  Spanish

• sel

  French

• sale

  Italian

• yan盐

  Mandarin

• shio塩

  Japanese

• milhملح

  Arabic

• tuz

  Turkish

• solсоль

  Russian

Salty, and that is the whole of it — one of the basic tastes, detected by dedicated receptors rather than by the olfactory route that carries every other seasoning in this dataset. What salt mainly does in food is not taste of itself: it suppresses bitterness, sharpens sweetness and acidity, and makes aroma compounds more perceptible, so a properly salted dish tastes more like itself rather than tasting salty.

White in almost every form. Rock salts carry mineral tints — the pink of Himalayan salt is iron oxide, the grey of sel gris is clay from the pond floor — at concentrations that colour the crystal and do not reach the tongue.

The property that actually distinguishes the products. Fine vacuum salt is dense, dissolves instantly and disappears; kosher salt is coarse, irregular and easy to pinch and scatter; flaked salt is a hollow pyramid that crushes between the fingers and gives a distinct crunch on the surface of food; coarse rock salt dissolves slowly enough to be useless as a finishing salt and ideal in a grinder or a brine.

• Sodium chloride — Effectively the entire product, at 97 per cent or more by weight in every food salt sold. The sodium ion carries the taste.
• Iodine (where added) — A public-health addition rather than a flavour one, though it is detectable as a faint metallic note by people who are looking for it.

Season in layers and weigh it when it matters. Salt added early has time to distribute and to do its physical work, and unlike every aromatic in this dataset it cannot be driven off or degraded by heat — so a sauce that reduces becomes saltier in exact proportion to what evaporates, and salting to taste before reducing is the commonest way to ruin one. Salt meat well ahead rather than at the pan: a coarse salt applied an hour or more before cooking draws moisture out and is reabsorbed as brine, which seasons throughout instead of only on the surface. The one thing that genuinely cannot be done by volume is substituting one salt for another, because fine, kosher and flaked salts differ in density by up to a factor of two; by weight they are identical. Finishing salt goes on at the end and off the heat, where the crystal survives to be felt.

Everything, which is why it is worth being precise about what it does. Salt seasons — supplying the salty taste directly — but most of its work in a dish is indirect: it suppresses bitterness, sharpens perceived sweetness and acidity, and makes aroma compounds more volatile and so more perceptible, which is why an underseasoned dish tastes flat rather than tasting unsalty. It also does physical work no other seasoning does: drawing water from vegetables, dissolving muscle proteins in a brine so meat holds moisture, controlling fermentation in pickles and kraut, and strengthening gluten in bread dough. It works with every food and every other seasoning in this dataset without exception.

• boiling — Nothing happens to the salt. It is thermally stable at any cooking temperature, does not evaporate and cannot be driven off, so salt added early stays in the dish and a reduced sauce becomes saltier in exact proportion to what has boiled away. This is the single most consequential fact about cooking with it.
• grinding — Changes dissolution rate and nothing else. A grinder on coarse rock salt produces the same compound as the fine salt in the box, which is why a salt grinder is a serving object rather than a flavour decision — unlike a pepper grinder, where the grinding genuinely releases volatiles.

There is not one, and the absence is the answer rather than an omission. Salt does not go stale, fade or weaken, so an open box tastes exactly as it did when it was bought. If it has clumped it has taken up water; break it up and use it.

• Caking or a solid block, which means moisture and not spoilage.
• Visible foreign matter in unrefined solar salt, which is a purity question rather than a deterioration one.
• Nothing else. Salt has no other failure mode.

The whole-versus-ground question maps onto fine-versus-coarse here, and unusually the answer is to own both rather than to choose. They are the same compound and they are not interchangeable by volume — a teaspoon of fine salt can hold nearly twice the salt of a teaspoon of flakes — so the practical rule is to weigh salt anywhere the quantity matters and to reach for the crystal that suits the job otherwise. A salt grinder is the one piece of equipment here that does nothing: grinding coarse salt produces fine salt, and the box already contained some.

• Decide on crystal size first — it is the only property that changes anything in the kitchen.
• One fine salt for baking and brining, one coarse or flaked for cooking and finishing, covers essentially everything.
• Check for anti-caking agents and iodine on fine salt; both are common and neither is present in most flaked salts.
• Ignore mineral and colour claims. Every food salt is 97 per cent or more sodium chloride and the rest is below any taste threshold.
• Buy the coarse and flaked salts in small quantities and the fine salt in large ones, because that is the ratio in which they are actually used.

Codex Alimentarius specifies food-grade salt on minimum sodium chloride content and contaminant limits, and says nothing about flavour because there is nothing to say. Retail naming — sea, rock, kosher, flaked, fleur de sel — describes production method and crystal form rather than any graded quality, and none of it is a standard.

• CN — major producer
• US — major producer. Mostly rock salt and vacuum-evaporated salt; the large majority of it never reaches food.
• IN — major producer. Solar evaporation, principally in Gujarat.
• DE — major producer
• FR (Guérande, Île de Ré) — notable producer. Hand-harvested solar salt, and the origin of fleur de sel as a named product.
• GB (Maldon, Essex) — notable producer. Flaked salt made by open-pan evaporation, the crystal shape being the entire product.

1. Solar evaporation — Seawater or brine is fed through a series of shallow ponds and left to concentrate in sun and wind until sodium chloride crystallises out and is raked off. Other minerals crystallise at different concentrations, so which pond the salt is taken from determines what else is in it.Why: The oldest route and the one that produces sea salt, fleur de sel and most Indian and Mediterranean salt.
2. Rock salt mining — Deposits left by seas that dried out over geological time are cut or drilled from underground seams, then crushed and screened. Himalayan pink salt is mined rock salt from a Punjabi deposit; its colour is iron oxide.Why: Bulk supply. Most mined salt is used for de-icing and industry rather than for food.
3. Vacuum evaporation — Brine is pumped from a deposit and boiled under reduced pressure, giving very pure, uniform, fine cubic crystals. This is what ordinary table salt is.Why: Purity and consistency, at the cost of any crystal character.
4. Additives — Anti-caking agents are commonly added to fine salt, and iodine is added in many countries under public-health programmes. Neither is present in most flaked or coarse salts, which is one of the few compositional differences between the products that is real.Why: Free flow and, in the case of iodine, a deliberate public-health measure rather than a culinary one.

Graded on crystal size, purity and additive content rather than on anything sensory. Codex Alimentarius sets a compositional standard for food-grade salt covering minimum sodium chloride content and contaminant limits; nothing in it addresses flavour, because there is nothing to address.

The interesting integrity question about salt is not adulteration but marketing. The compound is the same in every product on the shelf, and the trace minerals that specialty salts are sold on are present in quantities far too small to taste — what is actually being bought is crystal size, shape and dissolution rate, which are real and worth paying for in the right application. Colour claims are the clearest case: the pink of Himalayan salt is iron oxide at a fraction of a per cent, and it is a geological fact rather than a culinary one.

Only solar evaporation depends on climate, and it depends on it absolutely: hot sun, low rainfall and reliable wind. That is why solar salt comes from places like Gujarat, the Mediterranean coast and Western Australia, and why northern European producers use open pans over heat instead.

The only mineral in this dataset and the one with the largest history attached. Salt was a strategic commodity for most of recorded history because preservation depended on it: settlements formed around springs and pans, roads were built to move it, and states taxed it because everyone had to buy it. The Roman via Salaria carried salt to Rome; the French gabelle was a salt tax bitter enough to feature in the grievances of 1789; and the Indian salt tax made a monopoly on a substance freely available from the sea, which is precisely why Gandhi chose it for the 1930 march to Dandi. Refrigeration ended salt's strategic importance within a century and left it the cheapest thing in the kitchen.

Traded further and earlier than any spice, and for a completely different reason: not scarcity or aroma but preservation. Saharan caravan routes moved salt south to trade against gold, and the exchange rates recorded for those routes are the origin of a good deal of loose talk about salt being worth its weight in gold. Modern salt trade is industrial — the large majority of world production is used for chemicals and de-icing, and food salt is a small fraction of the tonnage.

Salt appears throughout traditional practice as a preservative, an antiseptic wash and a gargle. Recorded as tradition and as cultural context, and not as a health claim.