1. a person's name, or a mark representing it, as signed personally or by deputy, as in subscribing a letter or other document. 2. the act of signing a document. 3. Music. a sign or set of signs at the beginning of a staff to indicate the key or the time of a piece.
MAC Pigments. Contrary to popular belief, makeup does expire. MAC cosmetics are no exception. The majority of cosmetics expire in one year. However, there are certain cosmetics that expire in a few short months and certain cosmetics that last a lot longer than one year. The reason cosmetics have expiration dates is because over time bacteria builds up in them and when used they can cause infections, acne, and other nasty afflictions.
Since expired cosmetics can cause skin irritation and eye infections, it's important to replace them before they go south. A new study from Stowaway Cosmetics and Poshly found that 89 percent of women hoard old makeup just in case. Plus, fewer than one in five of us trash mascara within the recommended three months (we're guilty, too). Unlike food, cosmetics aren't required to have an expiration date on their packaging. Instead, you'll have to keep track of when you opened them.