impurities

Molten iron then separates from impurities and can be tapped off.

On its website, Elemetal says its specialized facilities melt gold sources such as scrap jewelry and impaired bullion to separate impurities and obtain refined gold.

Electrospinning using a starch-rich ingredient such as white flour is more challenging than using pure starch, as the impurities -- the protein and cellulose -- make the mixture more viscous and unable to form fibres.

No longer able to clean the blood of impurities, the Frankensteined kidney becomes a "pathological neuro-immune endocrine organ," as the UVA researchers describe it in a new scientific paper, that can cause serious health problems.

A Forest Service report said it could not rule out potential heavy metal impurities in retardant, which was hosed down from firefighting planes.