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. 4oz
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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