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How to Prevent Paint Coating Discoloration
When you notice that the color of a new brush door appears darker than the paint itself, you might wonder if the paint has discolored. Paint discoloration typically refers to changes in the varnish, which is originally clear, colorless, or very pale yellow. After discoloration, it may turn brown or even black. Color paints can also experience discoloration, often appearing darker than expected.
Several factors can cause paint to discolor:
- The ester solvents in the varnish can react with iron containers and turn black when exposed to water.
- Turpentine oil can produce reddish-brown pigments when stored in iron drums.
- Gold and silver powders are prone to acid etching, causing the paint to turn green, dark, or tarnished.
- Prolonged storage can lead to sedimentation and discoloration.
To prevent this issue, consider the following solutions:
- Shellac varnishes, which are most susceptible to discoloration, should be stored in non-metallic containers.
- Add gold or silver powders just before using the varnish. Avoid adding them too early, as this can lead to discoloration during storage.
- If discoloration occurs and it’s not due to a quality issue, thoroughly stir the paint before use to restore its original appearance.
By understanding the causes and taking preventive measures, you can maintain the quality and appearance of your painted surfaces for longer periods.
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