Generally, using 10-year-old nail polish isn't recommended due to potential degradation, but it depends on whether it has been opened or not.
Here's a breakdown:
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Unopened Nail Polish: If the nail polish has remained unopened for 10 years, it might still be usable. Unopened nail polish can last for 5-8 years according to experts. However, the quality may still be compromised due to settling and potential changes in the formulation over time.
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Opened Nail Polish: If the nail polish has been opened, it is highly unlikely to be usable after 10 years. Opened nail polishes typically last around 2 years. After this time, the solvents evaporate, causing the polish to become thick, gloopy, and difficult to apply smoothly. It will likely be unusable.
Factors Affecting Nail Polish Lifespan:
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Storage Conditions: Nail polish should be stored in a cool, dark place away from direct sunlight and heat. Improper storage can significantly shorten its lifespan.
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Frequency of Use: Frequent use introduces air into the bottle, accelerating the thickening process.
Signs That Nail Polish Has Expired:
- Thickness and Clumpiness: The polish is noticeably thicker than when it was new and difficult to mix.
- Separation: The pigment and solvents have separated and won't easily mix back together.
- Changes in Color or Smell: A noticeable change in color or a strong, unpleasant odor can indicate degradation.
What to Do if Your Nail Polish is Thick:
While using very old polish is not ideal, you might be able to revive slightly thickened nail polish with a few drops of nail polish thinner (not nail polish remover!). However, this won't work for extremely old or severely degraded polishes.
In conclusion, while unopened 10-year-old nail polish might be salvageable, opened polish is very likely expired and unusable. Examine the consistency and other factors to be sure.
