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A cold finger is a piece of laboratory equipment that is used to generate a localized cold surface. It is named for its resemblance to a finger as is a type of cold trap.
Typically a cold finger is used in a sublimation apparatus, or can be used as compact version of a condenser in either reflux reaction or distillation apparatus.
The device usually consists of a chamber in which a liquid (typically cold tap water) can enter and leave. Another version involves filling the device with a cold solid such as ice, or dry ice.
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 Dark green crystals of nickelocene, freshly sublimed on a cold finger. |
 Camphor being sublimed. Note the white purified camphor on the cold finger, and the dark-brown crude product. |
 A cold finger which includes a vacuum outlet. |
 Cold finger used in sublimation |
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