If i have black hair and i want to bleach a strip of it at home what do i do?

I already bought Garnier Blue Black hair dye and Garnier Bleach, but how do i keep the two colours from mixing?If i have black hair and i want to bleach a strip of it at home what do i do?
When doing the strips, put aluminum foil under them, apply the bleach, then roll up the aluminum foil into a little roll or ball where the black dye won't get into it.If i have black hair and i want to bleach a strip of it at home what do i do?
you need to have a professional do it and remember that it will not go from black to blonde on the first try, it will turn red and it will take a few times.





[edit] if your hair is not black yet, just keep the hair you are going to bleach separate with foil from the black hair. the darker your hair, the longer it will take to turn bleach blonde and you can easily damage your hair with bleach so it must be done in sessions if your hair is dark.





[edit2] i have no idea the condition or color of your hair so its hard to say. its better to give your hair a day or two to replenish moisture because bleach is extremely damaging to hair and overdoing it can wreck it for good and in some cases even melt it. like i said, a professional would be best because they can look at your hair in person and suggest whats best for your hair.
first you need to bleach the hair with the bleach you got follow the package instructions (havent use the one you got) you will strip your natural color to a orange yellow color.


then use the color that you got put it after the bleach follow the package info for using the color
Do them in two different sessions. Black first. Then do a bleaching session for the strip.





I don't know how well Garnier bleach works, but Clairol bleach didn't leave the red/orange coloring behind. I got white/yellow from it.





But a toner if it isn't the color you want. It might help.
oh my you already have black hair why put in the black/blue the blue doesn't show that much.anyway there is no way you can do it and have it look good i would consult a professional.
I sugggest you see a professional because i ruined my hair from doing it myself and now I wear a wig
do one, then after your done, do the other!!!