Signs of Degradation:
* Thickening: The polish becomes thick and goopy, making it difficult to apply smoothly.
* Color Change: Clear polish may turn slightly yellow or cloudy.
* Separation: The polish may separate into layers.
* Loss of Effectiveness: It may no longer provide the same level of protection or shine.
10+ Years is a Long Time:
Given your mom's nail polish is over 10 years old, it's highly likely that it has degraded significantly. The ingredients could have broken down, and it might not be effective or safe to use anymore.
Safety Concerns:
Using old nail polish can increase the risk of:
* Infections: Bacteria and fungi can grow in old nail polish.
* Irritations: Degraded ingredients can irritate the skin around your nails.
What to Do:
* Check for Signs of Degradation: Look for the signs mentioned above.
* Toss It If It's Suspicious: If the polish is thick, discolored, or otherwise looks questionable, it's best to throw it away.
* Buy New: It's always a good idea to replace nail polish every 1-2 years for optimal performance and safety.
Bottom Line:
While your mom's Magic Formula nail polish might not be dangerous, it's highly likely that its quality has suffered over the years. It's best to err on the side of caution and purchase a new bottle.