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Old Nassau reaction
The Old Nassau or Halloween Reaction, is a scientific demonstration of a clock reaction in which a solution turns orange and then black (the school colors of Princeton University), was discovered by two Princeton undergraduates researching the inhibition of the iodine clock reaction (or Landolt reaction) by Hg2+, resulting in the formation of orange HgI2. "Old Nassau" is the alma mater for Princeton, named for its historic administration building, Nassau Hall.
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