| Some scientists believe that crystal structure and impurities are central to whether a material becomes triboluminescent. |
| But beware, there could be someone out there spreading impurities about our profession. |
| The earliest soft magnetic material was iron, which contained many impurities. |
| Glass containers such as soda bottles and food jars are easy to recycle because they are free from impurities and have similar melting points. |
| Layering is defined by halite of different colours and grain size with various concentrations of different impurities. |
| The substitute eliminates the problem of donated blood being tainted by infections or impurities. |
