The video argues molten natron reacts with granite’s quartz to make a binder

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Key facts

• The cited 851°C melting point is for anhydrous sodium carbonate (Na₂CO₃); natron is a natural mixture containing hydrated sodium carbonate, sodium bicarbonate and other salts.
• Molten sodium carbonate can react with silica: Na₂CO₃ + SiO₂ → Na₂SiO₃ + CO₂. The sodium silicate product is commonly called water glass; this supports a reaction with granite’s quartz, not wholesale dissolution of every granite.
• Quartz is often a major component of granite at around one-half, but its proportion varies and is not always above 50%.
• Sodium silicate can be a white solid soluble in water. Aqueous sodium silicate is used as a binder, but simply adding water does not establish automatic conversion to silica gel or a final hardness of 6.5 on the Mohs scale.
• Natron is supported as an ancient glassmaking flux, but the cited evidence does not establish it as a general dissolver for basalt, diorite, volcanic tuff, sandstone and limestone, or that production required a constantly maintained 851°C wood/charcoal chimney kiln.
• The video interprets a heated blue-white scene in the Tomb of Rekhmire as molten-natron and water-glass production rather than metal smelting; that is the presenter’s theory, not an established identification.

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