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Reference.org
Chromium trioxide
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<p>Chromium trioxide (also known as chromium(VI) oxide or chromic anhydride) is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> CrO3. It is the <a href="/facts/Acidic_oxide/2h1jor4I">acidic anhydride</a> of <a href="/facts/Chromic_acid/jukMaHzR">chromic acid</a>, and is sometimes marketed under the same name. This compound is a dark-purple <a href="/facts/Solid/hj5UsXno">solid</a> under anhydrous conditions and bright orange when wet. The substance dissolves in water accompanied by hydrolysis. Millions of kilograms are produced annually, mainly for <a href="/facts/Electroplating/HbKf0SBb">electroplating</a>. Chromium trioxide is a powerful oxidiser, a <a href="/facts/Mutagen/xI5lKvmp">mutagen</a>, and a <a href="/facts/Carcinogen/soH8Y9CE">carcinogen</a>. </p>