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.
Here are my general guidelines for the average shelf life of most cosmetics: Powder based products (e.g. mineral foundation, eye shadows, blushes): 2-3 years. Liquid foundation: up to 1 year. Lipstick/gloss/liner: 2 years max for lipstick. Shelf life can be extended by refrigerating. Lip gloss with a wand applicator may have a shorter shelf life. Lip liner 1 to 2 years.