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Salts of the World · France

Sel gris (grey salt)

Coarse, damp, grey sea salt raked from the clay floor of French salt pans: an everyday cooking salt with character.

Sel gris de Guérande

By The Salt AlmanacUpdated November 8, 2026

Illustration of Sel gris (grey salt)
Illustration: The Salt Almanac · photo below

At a glance

OriginGuérande and the Atlantic coast, France
TypeSea salt
How it's madeIn the same pans as fleur de sel, crystals that sink are raked carefully from the clay bottom with a long wooden rake, piled to drain, and dried slightly.
Colour and textureLight grey from the clay, coarse, and moist: typically about 13% water.
Best forCooking: seasoning pasta water, roasting, salt crusts, brines. It can be ground for the table.
Swap withAny coarse sea salt; use a little less, because it is dense.
Protected nameGrey salt from Guérande is covered by the “Sel de Guérande” Protected Geographical Indication (2012).
Salt marsh pans on the Guérande peninsula with piles of harvested salt
Salt making on the Guérande peninsula, Brittany (2005).Photo: Bernd Reichelt. Public domain, via Wikimedia Commons · Image source

The story

Sel gris is the workhorse of the French salt marsh. The water over the clay floor can be as shallow as 6 mm, so the paludier has to rake without breaking the clay. Because it is much denser than table or kosher salt, a spoonful of sel gris holds noticeably more salt.

Label check

What the labels claim

These health claims appear on packaging and in wellness media. We include them so you can recognise them; none is supported by good evidence.

““Celtic” grey sea salt supports adrenal and digestive health”UnverifiedWhat the evidence says: No evidence. Grey sea salt is mostly sodium chloride with some moisture and clay minerals. “Celtic” is a brand name, not a type of salt.

Salt words on this page

Sel grisSea saltSalt pan (saltern)

Similar salts

Illustration of Fleur de sel de GuérandeFrance · Sea saltFleur de sel de Guérandefinishing saltBest for Caramel, tomatoes, eggsIllustration of Trapani sea saltItaly · Sea saltTrapani sea saltsun and wind saltBest for Fish and vegetablesIllustration of Kosher saltUnited States · Kitchen saltKosher saltcoarse kitchen saltBest for Seasoning by hand

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Cite this page

For school projects and reports. Teachers often prefer the original sources too: see the list below.

The Salt Almanac. (2026, November 8). Sel gris (grey salt). https://saltalmanac.com/salts/sel-gris-de-guerande

Original sources

  1. Wikipedia. Sel gris. https://en.wikipedia.org/wiki/Sel_gris
  2. INAO. Sel de Guérande ou Fleur de sel de Guérande (IGP). https://inao.gouv.fr/eng/produit/3665