A bit more:
As for the answer above that stated that gray hair absorbs color more quickly, that is definitely not the case. My gray hair takes much longer for the color to take than the hair that is still its natural color, as is also the case with gray hair for most people. So before dying it for the first time you need to do a test strand to determine how well your hair absorbs the color.
Only if it is an herbal hair dye.
Yes, it's just the natural color of her hair. (Depends on the real color of her hair)
no but you can dye it back to the original color
I am a hairstylist that specializes in haircolor. My best opinion is to go to a professional. To color gray hair you need the 3 primary colors that are missing to "fill" the hair (the remaining color in gray hair is missing you need to put those back in- if you don't you get color that fades, color that isn't true, etc) A warmer natural based color will do best.
Consult a hair stylist you trust.
Get some Grey Hair dye! WHY DO YOU WANT YOUR HAIR GREY?
yes
When you bleach your hair, you are stripping all color pigment from your hair. You will need to wait for new hair to grow back for your hair to return to normal.
his hair color is gray and black but mostly gray
Science hasn't taken us that far yet. That's why there's hair dye.
Yes. Blonde is the best to cover gray hair.
L'oreal Frost & Design Hair Color is ideal for gray hair. It offers coverage as well as a sublte way to blend gray into highlights.
Pick a hair dye that is specifically made to be used on gray hair, and the covering of gray hair. It will take to hair with no color for longer.