Eye irritation and infection:
* Bacteria growth: Old eyeshadow can harbor bacteria, especially if it's been exposed to moisture or used with dirty applicators. This bacteria can cause irritation, redness, itching, and even infections like conjunctivitis (pink eye).
* Mold growth: If your eyeshadow is stored in a humid environment or exposed to air, mold can grow. This can cause allergic reactions and irritation.
Changes in texture and color:
* Drying out: The formula can dry out and become crumbly or hard to apply, making it difficult to blend and increasing the risk of fallout.
* Color change: The pigment can fade, become dull, or even change color completely, making the shadow look different from what you intended.
* Chemical changes: The ingredients in eyeshadow can break down over time, potentially creating new compounds that can irritate the skin.
Other concerns:
* Allergic reactions: Even if you haven't had a problem with a particular eyeshadow in the past, an older formula can trigger allergies or sensitivities.
* Contamination: If you share eyeshadow with someone else, there's a risk of cross-contamination and the spread of bacteria.
General rule of thumb:
* Most eye shadow has a shelf life of 6 months to 2 years.
* Check the expiration date: Pay attention to the expiration date printed on the packaging.
* Signs of spoilage: Discard eyeshadow if it has changed color, texture, or smell, or if it's become clumpy or moldy.
* Clean applicators: Always use clean applicators and wash your hands before applying eyeshadow.
* Store properly: Keep eyeshadow in a cool, dry place, away from direct sunlight and heat.
It's always best to err on the side of caution and replace your eyeshadow regularly to ensure safety and the best application. If you experience any irritation or unusual symptoms after using eyeshadow, consult a doctor or dermatologist.