As such these contaminants - which include bones, metal, glass and stones — tend to be the focus for food producers in foreign body detection. (ishidaeurope.com)
To combat such contaminants, chlorine is often added which can affect taste. (icelandicglacial.com)
Normally the fungal sample would have been cleared of such contaminants, but this one resisted their attempts. (sciencedaily.com)