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Ammonium dichromate
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<p>Ammonium dichromate is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> (NH4)2Cr2O7. In this compound, as in all chromates and dichromates, <a href="/facts/Chromium/6sVk6Uu7">chromium</a> is in a +6 <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a>, commonly known as <a href="/facts/Hexavalent_chromium/lLgEDVPl">hexavalent chromium</a>. It is a salt consisting of <a href="/facts/Ammonium/jYm8wc1n">ammonium</a> ions and <a href="/facts/Dichromate/6xkFLIJw">dichromate</a> ions. </p><p>Ammonium dichromate is used in demonstrations of tabletop "volcanoes". However, this demonstration has become unpopular in schools due to the compound's carcinogenic nature. It has also been used in <a href="/facts/Pyrotechnic/Gocs5Gcu">pyrotechnics</a> and in the early days of <a href="/facts/Photography/ezLPT43M">photography</a>. </p>