The expiration date is always fresh. Gradually replaces gray with natural looking color. Stop any time and leave some gray. Conditions hair. Grecian formula liquid hair color with conditioner is not a typical hair color formula. It s more of a personalized version that actually lets you replace gray hair with your natural color. Plus you can always stop in between to keep a little gray to get an experienced look. Hair color comes from melanin and as we age melanin production in the body decreases. And Grecian formula replaces it with a similar pigment over time so you can control how much color you want in your hair. There s no mixing no mess. Apply daily for 2-3 weeks and you ll get the exact color that s perfect for you. Then use it once or twice a week to keep it that way.