I let mine go grey several years ago and was afraid it would be yellow as I had some red highlights in my natural hair. Sally's Beauty Supply has a shampoo call Shiney Silver but you don't want to use it but about every 3rd time you shampoo also Roux Fanci-Full rinse in white minx used on damp hair. don't overdo or you will have lavendar hair, but it will keep your hair from being dull.