• Webster's Revised Unabridged Dictionary
    • n Nitroprusside See Nitroprussic.
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Century Dictionary and Cyclopedia
    • n nitroprusside A compound of a basic element or radical with the dyad radical Fe.NO.(CN)5. Thus sodium nitroprusside, the compound most frequently prepared, has the composition Na2Fe.NO.(CN)5 and crystallizes with two molecules of water. Such a compound gives an intense but transient purple color with the solution of an alkaline sulphid, this reaction being often utilized for the detection of sulphur in minute quantity.
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In literature:

The liquid then contains nothing but nitroprusside and nitrate of potash or soda.
"A System of Instruction in the Practical Use of the Blowpipe" by Anonymous
The nitroprusside, however, gives a beautiful crimson-purple coloration.
"The Chemistry of Hat Manufacturing" by Watson Smith
Add a few drops of sodium nitroprusside solution, make alkaline with ammonia, then saturate with ammonium sulphate crystals.
"The Elements of Bacteriological Technique" by John William Henry Eyre