'impurity-colored' originates from the combination of 'impurity' and 'colored', where 'impurity' refers to the presence of unwanted substances and 'colored' indicates the alteration of color.

The term 'impurity-colored' evolved from the need to describe objects whose colors are altered due to impurities.

Initially, it meant 'colored due to impurities', and this meaning has largely remained the same in modern usage.