How can I prevent my foundation from oxidizing?

@tara 

There are a few tips you can follow to help prevent your foundation from oxidizing:

1. Choose the right shade: Make sure you are using a foundation shade that matches your skin tone correctly. If the foundation is too light or too dark for your skin, it may oxidize and change color once it comes in contact with air or natural oils on your face.
2. Use a primer: Apply a primer before your foundation to create a smooth base and to help the foundation adhere to your skin. Primers can also help control excess oils and prevent oxidation.
3. Control excess oils: If you have oily skin, excess oil can contribute to foundation oxidation. Use oil-control products, such as mattifying primers or setting powders, to reduce oiliness and prolong the wear of your foundation.
4. Set your foundation: After applying foundation, set it with a setting powder or setting spray. This step can help lock your foundation in place and prevent oxidation throughout the day.
5. Store foundation properly: Exposure to air can cause foundation to oxidize more quickly. Make sure your foundation bottles or tubes are tightly closed when not in use, and store them in a cool, dark place to minimize exposure to light and air.
6. Test before purchasing: Before buying a new foundation, try it on your skin and observe how it performs throughout the day. If you notice significant oxidation or color changes, consider trying a different formula or brand.

Remember, even with these tips, certain foundations may still be prone to oxidation due to their ingredients or formula. It's important to find a foundation that works well with your skin type and undertone to minimize oxidation.