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Cadmium selenide
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<p>Cadmium selenide is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the formula <a href="/facts/Cadmium/wXkV2eIX">Cd</a><a href="/facts/Selenide/vA9Ls4xH">Se</a>. It is a black to red-black solid that is classified as a <a href="/facts/II-VI_semiconductor/RMcsYTWQ">II-VI semiconductor</a> of the <a href="/facts/N-type_semiconductor/d9GPL5tV">n-type</a>. It is a pigment, but applications are declining because of environmental concerns. </p>