Salt of the Earth Part 2: uses around the ancient world

Salt of the Earth 

Part 2

Salt use in the ancient world 

Salt has been used and is widely used around the world. Let’s look at the main places in our past that have valued salt and its properties.

Salt in Ancient Egypt

Salt had many uses in ancient Egypt.

Perhaps its most famous role was in mummification. Egyptian embalmers used natron, a naturally occurring mixture of sodium carbonate, sodium bicarbonate and related salts, to dry the body.

Natron was not simply ordinary table salt. Its ability to remove moisture was crucial to Egyptian embalming techniques.

Natural natron deposits were particularly important in Egypt’s desert regions, including the Wadi Natrun.

Salt and salt-containing substances were also used in Egyptian food preservation and various practical and ritual contexts.

The Egyptian example demonstrates that the word “salt” historically covered a broader family of mineral substances than modern sodium chloride alone.

Salt in Ancient Greece

The ancient Greeks valued salt both as a food substance and as a commodity.

Salt was used to preserve fish, meat and other foods, and salted foods were important in long-distance trade.

Salt also acquired symbolic importance. It could be associated with hospitality, friendship and purification.

Greek religious practices included the use of salt in various ritual contexts. Salt could accompany offerings and was sometimes associated with purification.

The Greek word hals—meaning salt or sea—also survives in words associated with the sea and salt.

Salt in Ancient Rome

Salt became particularly important within Roman society.

The Romans used salt extensively for preserving food, including meat and fish. Salted foods were practical provisions for soldiers, travellers and urban populations.

Salt production and distribution also became matters of economic organisation.

The Via Salaria, the Salt Road, is traditionally associated with the movement of salt from the coast toward Rome. The existence of such routes demonstrates how valuable salt was as a trade commodity.

The modern word salary is sometimes popularly connected with Roman soldiers supposedly being paid directly in salt. This is an oversimplification. The Latin salarium was associated with an allowance or payment connected with salt, but there is no good basis for the popular claim that Roman soldiers routinely received their wages in physical salt.

Salt in China

China developed sophisticated salt-production industries very early in its history.

Chinese salt production included the use of salt wells and brine extraction, particularly in Sichuan.

One remarkable technique involved drilling deep wells to reach underground brine. Brine could then be brought to the surface and boiled to produce salt.

By the imperial period, salt had become an important source of government revenue. The Chinese state periodically established systems through which the production and sale of salt were controlled or heavily regulated.

This made salt an important example of how an everyday necessity could become a major political and economic commodity.

Salt in India

Salt has been central to South Asian history for thousands of years.

India possesses extensive coastlines, salt marshes, inland saline regions and mineral deposits, allowing salt to be produced in several different ways.

Traditional production has included solar evaporation of seawater and salt extraction from saline soils and lakes.

Salt also has an important place in Indian religious and cultural traditions. It appears in food customs, purification practices, folk medicine and symbolic traditions.

In more recent history, salt acquired enormous political significance during British colonial rule because the colonial government imposed taxes and restrictions upon salt production.

Mahatma Gandhi’s Salt March of 1930 famously challenged the British salt laws. Gandhi and his followers travelled to the coast and symbolically produced salt, turning an everyday substance into a powerful symbol of resistance to colonial authority.

Salt in Medieval Europe

During the Middle Ages, salt remained one of Europe’s most important commodities.

Salt was essential because refrigeration did not exist. Salting allowed meat, fish and other foods to survive through winter or to be transported over considerable distances.

Important salt-producing centres developed around coastal salt marshes, salt mines and brine springs.

Salt routes crossed Europe, linking production centres with inland markets.

The mineral was also valuable because it could be stored indefinitely under suitable conditions. This made salt particularly useful as a trade commodity.

Salt and Food Preservation

The most important historical use of salt was probably preservation.

Salt works by reducing the amount of water available to microorganisms. A sufficiently salty environment can inhibit the growth of many bacteria and fungi responsible for food spoilage.

Different cultures therefore developed their own salted foods.

Examples include:

• salted and cured meats;
• salt cod;
• salted herring;
• olives preserved in brine;
• pickled vegetables;
• salted eggs;
• fermented fish products;
• salted cheese;
• cured pork and bacon.

Salt was often combined with other preservation methods, including drying, smoking and fermentation.

The result was a remarkably effective food-preservation technology that supported travel, trade, military campaigns and survival through periods when fresh food was scarce.

Salt in Medicine

Salt has also been used medicinally throughout history.

Ancient and medieval medical traditions employed salt and saline preparations for wounds, skin conditions and various digestive complaints.

Salt water could be used for cleansing wounds, although historical medical practices were not always safe by modern standards.

Salt also became important in the development of oral rehydration therapy. Modern oral rehydration solutions use carefully measured quantities of sodium and glucose to help replace fluids and electrolytes lost through diarrhoeal illness.

This modern medical use should be distinguished from historical folk remedies: excessive salt consumption can contribute to health problems, particularly high blood pressure in susceptible individuals.

Salt of the Earth Part 1

 

Salt of the Earth

Part 1

Salt types and origins 

Salt is among humanity’s oldest natural resources. Chemically, ordinary salt is principally sodium chloride (NaCl), a crystalline mineral formed when saline water evaporates or when ancient deposits of seawater become buried and transformed into underground mineral beds. Its importance to human civilisation cannot easily be overstated. Before refrigeration and modern food preservation, salt was one of the principal ways in which meat, fish and other foods could be kept edible for extended periods.

Salt was also much more than a practical commodity. It became associated with purity, protection, friendship, hospitality and religious sacrifice in many cultures. Because it could preserve food and resist decay, salt acquired powerful symbolic associations with permanence and incorruptibility. Communities that controlled important salt sources could become wealthy through trade, taxation and manufacture, while salt routes connected distant regions of Europe, Asia, Africa and the Americas.

The Origins of Salt Use

Human beings probably began using salt long before written records. Animals naturally seek out salt deposits and salt-rich springs, and prehistoric people would have encountered exposed deposits, salty plants, coastal saltwater and mineral springs.

Archaeological evidence demonstrates that prehistoric communities deliberately collected and produced salt thousands of years ago. One particularly important development was the discovery that salt could be extracted from brine—water containing dissolved salt—by evaporation.

In some regions, people simply allowed seawater or natural brine to evaporate in shallow pools. In others, brine was heated in pottery vessels. The resulting salt crystals could then be collected and stored.

Salt production therefore developed independently in numerous parts of the world.

Sea Salt

Sea salt is produced by evaporating seawater, traditionally using sunlight and wind or, where necessary, artificial heating.

One of the oldest methods involved creating shallow evaporation ponds. Seawater was channelled into these pools, where successive stages of evaporation concentrated the salt until crystals formed. The crystals were then collected, dried and stored.

This method was particularly suitable for warm, relatively dry coastal regions.

Ancient Mediterranean societies became important producers and consumers of sea salt. The Greeks and Romans used salt extensively for preserving fish, meat and vegetables. Saltworks developed along suitable coastlines, and salt became an important commercial product.

The Romans were particularly dependent upon salt. Salt was used in food preservation and animal husbandry and was traded throughout the Roman world. The famous Via Salaria, or Salt Road, connected Rome with salt-producing areas around the Adriatic coast. Its name survives as evidence of the economic importance of salt.

Sea salt continued to be produced traditionally throughout Europe. In Britain, coastal salt production was particularly important in places such as Cheshire, Essex, Kent, Sussex and the Welsh coast, depending upon the period and local conditions.

Rock Salt

Rock salt, scientifically known as halite, is salt occurring naturally as a solid mineral deposit.

Rock-salt deposits were created when ancient seas or salt lakes evaporated and became buried beneath later geological layers. Over millions of years, these deposits could become enormous underground beds.

Unlike sea salt, rock salt is therefore obtained by mining rather than by evaporating modern seawater.

Ancient peoples sometimes gathered salt from exposed deposits at the Earth’s surface, but underground mining eventually became an important source. Miners could extract blocks or chunks of salt from underground chambers and galleries.

Rock salt has been especially important in regions with ancient evaporite deposits, including parts of Britain, Poland, Germany, Austria, Pakistan, India and the United States.

The famous Wieliczka Salt Mine in Poland is one of Europe’s best-known historical salt-producing sites. Salt has been extracted there since the Middle Ages, and the mine eventually developed an extraordinary underground landscape containing chambers, sculptures and religious spaces carved from salt.

Cheshire Salt

Britain has an especially important history of salt production in Cheshire, where extensive underground deposits of rock salt were created by the evaporation of ancient seas.

Cheshire’s salt industry has existed for many centuries. Natural brine springs were known in the region during the Roman period, while large-scale production subsequently developed around places such as Northwich, Middlewich and Nantwich.

Rather than mining only solid salt, much traditional Cheshire production involved extracting natural underground brine. The brine was brought to the surface and evaporated by heating it in large pans.

This created a distinctive industrial landscape of brine wells, salt pans, furnaces, warehouses, canals and later railways.

Cheshire salt became an important commodity because it could be used to preserve meat, fish and other foods. The industry also stimulated local trade and employment.

Brine Salt

Brine salt is produced from naturally occurring or artificially created salty water.

Natural brine springs have been exploited for thousands of years. A community might discover that a particular spring or underground water source produced unusually salty water. Rather than relying upon seawater, people could collect this brine and evaporate it.

One traditional technique involved boiling brine in large ceramic, lead or metal vessels. As the water evaporated, salt crystals remained.

This method was particularly valuable in inland regions where seawater was unavailable.

Archaeologists have discovered evidence of prehistoric salt-making using brine in several parts of Europe. In Britain, prehistoric salt production is known from archaeological sites where salt-rich water was evaporated in specially made briquetage vessels.

Solar Salt

Solar salt is produced primarily through natural evaporation by the sun and wind.

This technique is closely related to traditional sea-salt production. Large shallow ponds are arranged so that seawater gradually becomes more concentrated as it moves from one pond to another.

Eventually the solution becomes saturated and salt crystallises.

Solar evaporation is particularly effective in places with warm climates and relatively low rainfall. Important traditional salt-producing regions have included parts of the Mediterranean, North Africa, the Middle East, India and China.

One advantage of solar salt production is that it requires comparatively little fuel. Instead, the energy of the sun performs much of the work.

Salt from Salt Lakes

Salt has also traditionally been collected from salt lakes and salt flats.

One of the world’s most famous examples is the Dead Sea, whose extremely saline waters have been associated with mineral collection and salt production for thousands of years.

Salt lakes can become extraordinarily concentrated because water evaporates while leaving dissolved minerals behind. In exceptionally dry environments, thick salt crusts may form around the edges or across parts of a lake.

Communities could collect these deposits directly or process saline water to obtain salt.

The Salar de Uyuni in Bolivia is another spectacular example of a modern salt landscape, although its industrial importance is associated not only with salt but also with other minerals contained within the enormous salt flat.

Himalayan and Pink Salt

The term Himalayan salt generally refers to rock salt mined in Pakistan, particularly from the Khewra Salt Mine in Punjab.

The deposits are ancient evaporites created from prehistoric seas. The salt can contain small quantities of other minerals, giving some varieties their characteristic pink, orange or reddish colouring.

The Khewra deposits have a long history, although many modern claims surrounding Himalayan salt’s special nutritional or therapeutic qualities go beyond what scientific evidence demonstrates.

Historically, however, the important point is that this is rock salt, extracted from an ancient underground geological deposit rather than harvested directly from modern Himalayan seawater.

Black Salt

Several different products are called black salt, making the term historically complicated.

One traditional South Asian variety is kala namak, a mineral salt used extensively in Indian, Pakistani and neighbouring cuisines. It has a distinctive sulphurous smell and flavour.

Its characteristic properties result from the minerals and processing involved rather than simply from ordinary sodium chloride.

Black salts have been used traditionally in food and, within Ayurvedic traditions, have also been incorporated into certain preparations.

Another completely different category is salt that becomes dark through contamination with charcoal, minerals or other substances. Consequently, historical references to “black salt” must always be considered in their cultural context.

Celtic and Grey Sea Salt

Traditional grey sea salt, sometimes associated with French Atlantic salt production, is collected from salt marshes and coastal evaporation ponds.

The grey colour can result from the clay-rich environment in which the salt crystals form.

The salt-producing marshes of Guérande in Brittany are particularly famous. Traditional salt workers, known as paludiers, have harvested salt from shallow coastal ponds for centuries.

The industry illustrates an important principle of historical salt production: salt could be obtained not merely from the sea itself, but from carefully managed coastal landscapes.

On  part 2 I will look more into how salt has been used in history and how it has influenced culture and location changes,