![]() The slaked lime, a dense and moist substance, would then be stored in a designated pit for several months, or even years, to ensure complete hydration. The resulting substance, known as quicklime or lump-lime, was subsequently pulverized into a fine powder and combined with water in a process called "slaking." Through this procedure, a fundamental binding agent called " lime putty" was created and utilized for plastering purposes. Nevertheless, this transformative process, which involved converting limestone into calcium oxide, carbon dioxide, and steam, posed significant challenges due to the requirement of extremely high temperatures, reaching approximately 2200☏. The Greeks, in particular, made a remarkable discovery regarding the production of a special adhesive by subjecting limestone rocks to intense heat within expansive ovens. Throughout ancient times, lime was a widely employed material for constructing plaster on both interior and exterior walls. The technique was highly valued for its durability and aesthetic appeal, and it has continued to be used and refined throughout history. The history of polished plaster can be traced back to ancient times, with evidence of its use in ancient Egyptian, Roman, and Greek architecture. Polished plaster is usually sealed with a protective layer of wax. They are finished ( burnished) with a specialised steel trowel to a smooth glass-like sheen. Such plasters are usually applied over a primer and basecoat base, from one to four layers. Polished plaster is mainly used internally, on walls and ceilings, to give a finish that looks like polished marble, travertine, or limestone. A lime-based polished plaster may contain over 40% of marble powder. Polished plaster itself tends to consist of slaked lime, marble dust, and/or marble chips, which give each plaster its distinctive look. ![]() ![]() The term covers a whole range of decorative plaster finishes, from the very highly polished Venetian plaster and Marmorino to the rugged look of textured polished plasters. ![]() Polished plaster is a term for the finish of some plasters and for the description of new and updated forms of traditional Italian plaster finishes. ![]()
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