karbonatizacija

Kemijski proces spremembe gašenega apna nazaj v prvotno stanje, v apnenec. Ob stiku z zrakom gašeno apno, kalcijev hidroksid, Ca(OH)2, iz zraka sprejema ogljikov dioksid, CO2, vanj pa oddaja vodo, H2O, in se tako spremeni nazaj v kalcijev karbonat, CaCO3. Proces karbonatizacije je temelj tehnike slikanja al fresco in omogoča njeno obstojnost, saj se poslikava, narejena v tej tehniki, praktično spremeni v kamen.

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