Overall change in the colour of a material, usually to a darker, more yellow or brown appearance. May be caused by light damage or by exposure to acidic substances.
![](https://aiccm.org.au/wp-content/uploads/2019/10/Discolouration_500.jpg)
Overall change in the colour of a material, usually to a darker, more yellow or brown appearance. May be caused by light damage or by exposure to acidic substances.