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Selenium is a chemical element; it has the symbol Se and atomic number 34. It has various physical appearances, including a brick-red powder, a vitreous black solid, and a grey metallic-looking form. It seldom occurs in this elemental state or as pure ore compounds in Earth's crust.
Selenium, like manganese, can be used in small concentrations to decolorize glass, or in higher concentrations to impart a reddish color, caused by selenium nanoparticles dispersed in glass. It is a very important agent to make pink and red glass. When used together with cadmium sulfide, [9] it yields a brilliant red color known as "Selenium Ruby".
The use of a cotton swab or melamine foam (used in “eraser” cleaning sponges) as a support has also been suggested. [ 7 ] [ 8 ] [ 6 ] Sodium is a common component or contaminant in many samples, [ 2 ] and its spectrum tends to dominate many flame tests others. [ 5 ]
It has been used to fight blazes in the US since 1963, and is the main long-term fire retardant used by the California Department of Forestry and Fire Protection.
The vibrant red fire retardant is known as Phos-Chek and has been used by firefighters battling wildland blazes for over 50 years, according to its manufacturer, Perimeter Solutions.
The petition filed by over 20 consumer advocacy groups in 2022 that argued for the removal of Red Dye No. 3 from food and dietary supplements cited studies, the FDA's prior use of the Delaney ...
It is used, for example, to make sodium lamps. [177] Selenium compounds can be used both as decolourising agents and to add a red colour to glass. [178] Decorative glassware made of traditional lead glass contains at least 30% lead(II) oxide (PbO); lead glass used for radiation shielding may have up to 65% PbO. [179]
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