How' do I lighten my Dark colored hair without killing it? I've used darkest brown by nice and easy for two years. I'm too old and my hair is too long to keep it this dark.

How to Remove Hair Dye From Your Hair | eHow.com

How to Remove Hair Dye That Is Too Dark

Step1
If you decided to try on a darker shade of hair color only to have it turn into a nightmare, rest assured that steps can be taken to correct this blunder. The key is to act as quickly as possible for best results. It is much easier to remove dye from your hair if the color is just a few days old.
Step2
Try L'Oreal's Color Zap for a quick at-home reversal of your color blunder. This easy-to-use kit works after one application, gently removing dye from your hair while leaving your natural hair color intact and ready to re-color. This product works even on permanent hair dye.
Step3
If your new hair dye is only marginally darker than desired, you may want to try prematurely fading it. If the color you used was a semi-permanent color, rest assured that these colors fade quickly on their own and the process can be sped up by simply washing your hair more often.
Step4
If your too-dark hair dye is permanent, it can sometimes be faded by washing with a clarifying shampoo. Use one that is designed to remove product build-up or chlorine build-up from swimmer's hair. These shampoos remove anything coating the hair shaft, including excess pigment.
Step5
Clarifying shampoos not doing it for you? Try using Head and Shoulders dandruff shampoo. This shampoo has long been known for its ability to strip color from hair. If you really need to fade your too-dark hair quickly, try shampooing with Head and Shoulders until your hair fades to the desired shade.