Proper storage of your brown mascara can significantly extend its lifespan and maintain its quality. Here are some best practices to follow:

1. Store in a Cool, Dry Place: High temperatures can cause the mascara to dry out and clump, while excessive moisture can encourage the growth of bacteria. A cool, dry place like a drawer in your bedroom is ideal.

2. Keep it Upright: Storing your mascara upright helps the product to distribute evenly, ensuring the wand is well-coated each time you use it.

3. Avoid Sunlight: Direct sunlight can heat up the mascara, causing it to dry out. It can also degrade the quality of the pigments, leading to a change in color and consistency.

4. Tighten the Cap: Always ensure the cap is screwed on tightly after each use. This prevents air from getting in and drying out the mascara.

5. Avoid Pumping the Wand: While it may seem like a good idea to pump the wand to get more product, this can actually introduce air into the tube, causing it to dry out faster. Instead, swirl the wand inside the tube to pick up the product.

6. Regular Cleanings: Clean the wand periodically with a makeup remover to prevent clumps and bacterial buildup.

7. Don't Share: Sharing mascara can spread bacteria and infections. To maintain the hygiene of your product, it's best to keep it to yourself.

Remember, despite your best efforts, mascara does have a limited shelf life. Most mascaras should be replaced every three to six months to prevent eye infections and maintain optimal performance.