Pozzolana is ground vocanic ash composed of siliceous and aluminous material from Pozzuoli, Italy. Use in fresco painting to make hydraulic plaster for stronger walls. 1 kg (2.2 lbs)
Crushed fragments of brick used in antiquity to make mortar or plaster for walls.
Mix with lime and sand to make hydraulic� plaster, wich ancient Romans called Opus signinum, for the underlayers of fresco wall painting. Cocciopesto reacts with lime to form plaster with cementious properties.
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