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potassium dichromate

noun

, Chemistry.
  1. an orange-red, crystalline, water-soluble, poisonous powder, K 2 Cr 2 O 7 , used chiefly in dyeing, photography, and as a laboratory reagent.


potassium dichromate

noun

  1. an orange-red crystalline soluble solid substance that is a good oxidizing agent and is used in making chrome pigments and as a bleaching agent. Formula: K 2 Cr 2 O 7
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of potassium dichromate1

First recorded in 1880–85
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Example Sentences

On boiling it with copperas it becomes violet, while on boiling with potassium dichromate it changes to a yellowish brown.

Potassium dichromate, 3/8 oz.; hot water, 1/2 pint; dissolve, and add all together.

Potassium dichromate might therefore be called potassium pyrochromate.

Another patent, taken out in 1879 by Heinzerling, specified the use of potassium dichromate and alum.

This is performed in a solution of potassium dichromate rendered alkaline with ammonia.

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