The U.S. Army Corps of Engineers is organized geographically into eight permanent divisions, one provisional division, one provisional district, and one research command reporting directly to the HQ. Within each division, there are several districts.
Laser Safety Glasses - Holmium Laser. 1  On this page you will find our range of Holmium laser safety glasses , Ruby laser safety glasses, Dye and Erbium Laser Safety Glasses. 2  Important: Australian laser safety standards AS/NZS 2211.3:2002 require L-Ratings to be clearly marked on the laser glasses.
Chromium(III) oxide is a metal polish known as green rouge. Chromium salts color glass an emerald green. Chromium is what makes a ruby red, and therefore is used in producing synthetic rubies. also makes a brilliant yellow for painting As a catalyst. Chromite is used to make molds for the firing of bricks.