Perky-Pet Hummingbird Nectar Concentrate is the most convenient way to fill your hummingbird feeders. An exclusive blend of pure sugars. The easy-to-use formula mixes with plain tap water and is ready to feed; there's no boiling necessary. Leftover nectar can be stored in the refrigerator. Contains U.S.D.A. approved red food coloring. This package contains six individual packets, and each one makes one quart of nectar. Perky-Pet Hummingbird Nectar Concentrate is the most convenient way to fill your hummingbird feeders.