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.
Required or not, some manufacturers do print expiration dates on their products. If it's not clearly printed on the container as something like Exp 12/2015, look for what's called a Period After Opening (PAO) date.ou won't find an expiration date printed on most cosmetic products, thanks to a lack of regulations. In the US, only the products the FDA considers drugs are required to have an expiration date; these include sunscreen, acne medicines, and products that treat dandruff.