To extend the life of your color, shampoo no more than twice a week using cold water and color safe shampoo and conditioner. Shampoo your scalp/roots only and let the shampoo rinse over the rest of your hair. Dry shampoo is also recommended between washes.
Avoid using hot water, chlorine pools/hot tubs, ocean/lake water, and direct sunlight for extended periods of time. If you use well water, a shower filter will also prevent any mineral deposits in hair which can alter your color.