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CAS Registry Number on CSI New York

When the investigators in a recent television episode of CSI New York needed to identify a certain substance, they accomplished this by using a CAS Registry Number. 

The substance of interest turned out to be silica, a compound containing silicon. The CAS Registry Number that identifies silicon was displayed on a handheld device:

CAS REGISTRY ID: 7440-21-3

A wealth of information on silicon, silica, and 52 million other organic and inorganic substances is available in the CAS REGISTRY database!

Check out CAS on CSI New York...

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For substance identification, turn to the CAS REGISTRY^SM

Here is the substance record for 7440-21-3, as it appears in SciFinder: