Assertion: potassium cyanide | /r/HasProperty | double salt
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Source sentences:
text: The commercial product now made by improved methods of manufacture is actually sodium cyanide, but is called “potassium cyanide” (probably with the words “ double salt ” on the label); it contains cyanide equivalent to something over 100 per cent, of potassium cyanide in addition to a large proportion of sodium carbonate and other impurities.