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Copper is a chemical element with symbol Cu (from Latin: cuprum) and atomic number 29.
C 4672 (OTTO) Copper powder, -100 mesh, 99.999% Cas 7440-50-8 - used as the printing plate in etching, engraving and other forms of intaglio printmaking. Copper compounds are also used as bacteriostatic agents, fungicides, and wood preservatives.