This salt of silver, when applied in solution to hair ... Either ammonia or hydro-sulphuret of ammonia is necessary to color grey hair black ; a strong solntion of galls or sumac may be ...
Here’s Vogue’s pick of some of the best shampoos for grey hair. “Purple shampoos are a lifesaver for grey and silver hair,” says Fletcher-Holmes. “The violet pigments neutralise yellow and brassy ...