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The properties of copper are highly susceptible to impurities.
en.wikipedia.org The impurities measured are at the atomic level within the crystal lattice of carbon atoms and so, unlike inclusions, require an infrared spectrometer to detect.
en.wikipedia.org Even small quantities of such impurities can cause such effect.
en.wikipedia.org They also serve a function as scavenger for impurities (e.g. water) in reactions that are sensitive to these impurities.
en.wikipedia.org There must be no impurity in the powder.
en.wikipedia.org