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Invisible ultraviolet electromagnetic energy near the visible spectrum; useful for exciting fluorescent paints, dyes, etc., so that they become visible.

A high-quality bituminous paint used as a metal varnish.

A hot-formed bolt covered with black scale, not of uniform diameter; used in steel construction.

1. A body whose radiation at each wavelength is the maximum possible for any electromagnetic radiator at that temperature. 2.

A mixture of high-calcium lime, water, and ashes or clinker which relies on its pozzolanic properties for its hard set.