Opus albarium
From Infogalactic: the planetary knowledge core
Opus albarium is the Latin name for a refined type of plasterwork used in the interiors of houses, consisting of a special stucco incorporating marble dust, then beaten compact with rammers: the technique is described by Vitruvius (VII.3.4-11). Varro states (R.R. I.59.2) that such wall coatings make buildings cooler.
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