Glossary

Yellowing

All surfaces exposed to light or atmospheric oxygen will turn yellow to a lesser or greater extent over the course of time. Yellowing is primarily triggered in the light waveband of 350 to 400 nm. A large number of unmodified clear lacquers are not capable of absorbing in this waveband, meaning that wood can only be protected by the addition of UV absorbers. The addition of so-called light stabilisers, UV protection or UV absorbers to the lacquers may delay yellowing, but not prevent it completely. It is important for light protection lacquers not to have any, or hardly any, colour of their own. Where a yellowish lacquer is applied to light wood, the lacquer film will lend a yellowish/yellowed tone to the wood, no matter how much light stabiliser is applied

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