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Researchers develop invisible nontoxic coating to preserve marble

A team of researchers from Princeton has developed a low-cost and nontoxic treatment to help preserve iconic stone structures exposed to decay.

Developed by the researchers in collaboration with an international team, the treatment involves the application of a thin film of a calcium compound called hydroxyapatite, which is formed by the reaction of a water-based phosphate salt solution and calcite, the mineral that makes up marble. The solution seeps into and binds cracks in the marble's surface, creating a stronger building or monument that’s also more resistant to environmental pollution and rain.

The study not only discovered that hydroxyapatite has excellent sticking properties but also that their method has the advantage of being based on a nontoxic solvent (water), being able to penetrate deep inside marble cracks, and reacting in just 24 hours

Source: www.architectureanddesign.com

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