zinc dust

zinc dust
noun
: powdery metallic zinc usually containing zinc oxide in varying amounts that collects as a bluish gray powder during distillation of zinc and that is used chiefly as a reducing agent, as a pigment in corrosion-resistant coatings for iron and steel, and in sherardizing

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zinc dust,
a gray powder, usually containig zinc oxide, used as a reducing agent, a bleach, and in rust-resistant paints.

Useful english dictionary. 2012.

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