Molten natron reaches 851°C and etches quartz — which exceeds 50% of granite's composition. The residue, called water glass, becomes a silica gel binder when mixed with water, setting to 6.5 on the Mohs scale. The Tomb of Rekhmire may depict this, with a blue-white substance heated over a fire.
Molten natron at 851°C dissolves granite into water glass binder

Key facts
- Molten natron forms at 851°C and etches quartz in granite (which makes up 50%+ of granite)
- The residue is called water glass, a white water-soluble powder
- Mixed with water, water glass becomes a silica gel binder
- Water glass sets to 6.5 on the Mohs scale, as hard as granite
- Natron acts as a dissolver for basalt, diorite, volcanic tuff, sandstone, and limestone
- The process requires a consistent 851°C temperature maintained by a wood/charcoal chimney kiln
- The Tomb of Rekhmire contains depictions of a blue-white substance heated over a fire, reinterpreted as molten natron and water glass production rather than metal smelting
Sources
Natronen.wikipedia.org
Natron is a naturally occurring mixture of sodium carbonate decahydrate … natron has had many practical applications that continue today in the = 115.85° ...
The Natron Theorynatrontheory.com
Natron glass is nothing more than natron, sand and limestone "cooked" together on 851 degrees Celsius. Which means Egyptians were able to melt natron since the ...
The Granite "Mistake"natrontheory.com
What is molten natron? Molten natron is a liquid. At 851 degrees Celsius, it turns into a glowing, corrosive reddish liquid from its fine white powder form.
What is Molten Salt?moltensalt.org
... Molten Salt Oxidation (MSO). The molten salt used is usually sodium carbonate heated above its melting point of 851° C ( 1564° F) to around ...
Low-Dimensional Network Formation in Molten Sodium ...pubmed.ncbi.nlm.nih.gov
by MC Wilding · 2016 · Cited by 32 — Molten carbonates are highly inviscid liquids characterized by low melting points and high solubility of rare earth elements and volatile
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