it depend on how blonde you want your hair juss leave the beach in till the desired blondee
long hair
3hours
Around 25 Years.
45-60 mins MAX
Most likely, if you used dye, it stands on the package
It depends on what type of hair you have. soft, straight take about 45 mins- 1 hour. dirty and greasy take twice as long
It can cause irritation and chemical burn the skin. The same happens to your scalp if you leave it on to long.
about 10 minutes i am a hairstylist so that's what i believe.
no, it won't bleach your hair but it will dry it out!
You can leave bleach on the hair for up to an hour. After this it will not work. You have to make a fresh batch. The more time that the bleach is out in the air the less time you have to put it on the hair. The ends are dark because there is more of a build up of colour there. You will have to do this on a few separate occasions. Because your hair is black the bleach will take longer to take the colour out. Black changes to red, the orange then blonde, it does take longer to get black out.
it goes gold
doing this will mess the hair up by making the hair dissolve infront of you which will leave you with no hair so i would not advise using bleach with water if you do want to keep your hair.