During this project I discovered that many cosmetic products clam to resist the growth of bacteria or other harmful organisms, but the expiration dates on cosmetic products are there for a reason. Consistent application of makeup introduces bacteria and germs to the applicators and the makeup itself. Especially if you apply it with your hands! Most bacteria in cosmetics, comes from a host. That's why you really don't want to let other people use your make-up. Another way is if it has expired its shelf life or has been exposed to other elements, (Falling in water, laying in a hot car, etc.) that will promote bacteria growth. Germs on makeup testers isn't a cause for public panic, but it is unhygienic and worth avoiding. WHAT TO AVOID:
Avoid testing on lips and eyes, which are the most vulnerable to infection; use the back of your hand. Try makeup at a counter manned by a salesperson who can oversee hygienic usage, including single-use applicators. Wash your hands with soap and water or use a hand sanitizer before and after visiting a makeup counter.
Test only products that come from a shaker or a squeeze or pump dispenser, or those that are single use. Have an in-store makeup artist apply testers for you. "They are trained by the cosmetic companies to use sanitary measures, including disinfecting their hands, sharpening pencils, and spraying makeup brushes with antibacterial spray between customers.
Staphylococcus epidermidis is a form of staph bacteria that has been found on lipsticks, eyeshadows and eyeliners during laboratory testing. While this bacteria often is found naturally on human skin, for those with a compromised immune system--due to a severe illness, old age or a chronic illness--may develop an infection. Some strains of this bacteria are resistant to antibiotic treatment and can severely affect the intestines if left untreated. STAPHYLOCOCCUS WARNERI:...
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