New York , NY
Heating Lime Limelight
Photograph - Photograph
A sample of chalk (having previously been converted to lime in a kiln) glows while being heated. Lime is produced by heating calcium carbonate until the extra carbon and oxygen atoms are driven off leaving just the calcium oxide, or quicklime, which is used to make limelight (a historic type of stage lighting and source of the phrase "in the limelight"). Lime can be made from sea shells, chalk, and many types of rock, including marble.
June 1st, 2013
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