Nowadays, many decorative panels on the market tend to change color after being coated with varnish. For example, white oak and white maple can develop a yellowish tint once painted, and it's commonly believed that the longer they are exposed, the more pronounced this yellowing becomes.
When choosing a decorative panel, it's a good idea to wipe it with a damp cloth to get a better sense of how the finish will look after varnishing. Over time, these panels may naturally darken and oxidize, which can lead to some yellowing. This is why selecting the right type of varnish is crucial for maintaining the desired appearance.
Here are the common causes of varnish discoloration and ways to prevent it.
The main reasons for discoloration include:
(1) Ester solvents in the varnish may react with iron containers, causing black stains when exposed to moisture.
(2) Turpentine oil can produce reddish-brown pigments when stored in iron drums.
(3) Gold and silver powders mixed with varnish are prone to acid etching, leading to green, dark, or dull colors.
(4) Prolonged storage can result in sedimentation and discoloration of the varnish.
To prevent these issues, consider the following measures:
(1) Store shellac-based varnishes in non-metallic containers to avoid chemical reactions.
(2) Add gold and silver powders just before applying the varnish, rather than mixing them in advance for long-term storage.
(3) If the coating shows discoloration, check whether it's due to a quality issue. In most cases, thorough stirring can restore its original appearance.
Understanding these factors can help you make better choices when selecting and applying decorative panels and varnishes, ensuring a more consistent and long-lasting finish.
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