“Surma is made from antimony sulfide, but it may contain lead as an accidental impurity that remains in antimony sulfide, or it may be an intentional adulterant.”

“A black border around the edge of the deposit is always the first evidence of impurity of the solution.”

“Inquiries on mortality prove beyond a doubt that, of the causes of death which usually are in action, impurity of the air is the most important.”

“Now they all felt that impureness, they all felt that something just wasn't right here, but none of them spoke of it, none of them wanted the others to think them crazy.”

“The sample was washed with acetone and distilled water in order to wash the impureness from the surface.”

“Use this all-over body scrub before bathing to deep-cleanse and loosen surface impurities.”

“Layering is defined by halite of different colours and grain size with various concentrations of different impurities.”

“But beware, there could be someone out there spreading impurities about our profession.”