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Discolouration (Noun)

A soiled or discolored appearance; "the wine left a dark stain".

Nouns denoting attributes of people and objects.

The act of changing the natural color of something by making it duller or dingier or unnatural or faded.

Nouns denoting acts or actions.

The discoloration of the painting over time had made it almost unrecognizable from its original state.
The skin discoloration on her face was a result of years of exposure to the harsh sun.
The discoloration of the teeth was a clear indication of poor oral hygiene and lack of regular dental check-ups.
The discoloration of the fabric was due to the use of low-quality dyes that faded quickly.
The discoloration of the water in the aquarium was a sign that the filter needed to be replaced.