Definition of "impurities" []

• Plural form of impurity. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "Raise the heat to high and cook the liquid until reduced by about half, about 20 minutes, occasionally skimming any impurities from the surface."
• "Whether we weigh the elements in their uncombined state or weigh them in the form of some compound of known composition, we must be very sure that conditions are such as to make possible the exclusion of all complicating impurities from the scale pan."
• "Make sure to wash off as much of the "impurities" - icky foamy stuff - as possible."