Description of the defect
Change in colour tone of a coated surface
Cause of the defect
- Use of a CN varnish as finishing lacquer on a light substrate.
- Use of a non-light-fast polyurethane system as finishing lacquer on a light substrate.
- Changing the substrate and/or the components that give the colour .
The yellowed layer of lacquer must be completely removed and replaced with a yellowing-resistant coating.
On the whole, age-related changes to the wood cannot be rectified.