+**Impurity** refers to any [Substance](/wiki/substance) or element present in another that is not intrinsically part of its original, desired composition. It often alters the inherent [Properties](/wiki/properties) of a material, sometimes enhancing, sometimes diminishing, its intended nature.
+## See also
+- [Purity](/wiki/purity)
+- [Contamination](/wiki/contamination)
+- [Mixture](/wiki/mixture)
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