The Natron valley near Cairo, Egypt, annually …

Years: 2637BCE - 2494BCE

The Natron valley near Cairo, Egypt, annually forms lakes when inundated by the floodwaters of the Nile, because it is below sea level.

These lakes become nearly dry during summer, leaving a deposit of a white, saltlike substance eventually called natron.

The substance, also called natrum, is principally sodium carbonate containing smaller quantities of sodium bicarbonate, sodium sulfate, and sodium chloride.

Blended with oil, it is an early form of soap, and will be used for thousands of years as a cleaning product for both the home and body.

It softens water while removing oil and grease.

Undiluted, natron is a cleanser for the teeth and an early mouthwash.

The mineral is mixed into early antiseptics for wounds and minor cuts.

Natron can be used to dry and preserve fish and meat, for making leather, and to bleach textiles; it is also an ancient household insecticide.

The mineral is used in Egyptian mummification because it absorbs water and behaves as a drying agent.

Moreover, when exposed to moisture the carbonate in natron increases pH (raises alkalinity), which creates a hostile environment for bacteria.

In some cultures, natron is thought to enhance spiritual safety for both the living and the dead.

Natron is added to castor oil to make a smokeless fuel, which allowed Egyptian artisans to paint elaborate artworks inside ancient tombs without staining them with soot.

Natron will be used for millennia for embalming, in ceramic pastes, as a detergent, and, when mixed with sand, in the production of glass.

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