What kind of developer do you use and how long do you leave it on? What color is your natural hair?
Most Helpful Girl
It depends on the result I want to achieve. I usually use either 30 or 20 or both - in order not to use only 30 because 30 and 40 developers can damage your hair if they are used in large quantities.
I mix them with the hair dye -usually ash blonde-.
I do NOT use a decolor powder it can be very harmful, so I wouldn't recommend you to do that.
I leave it on for around 30 minutes.
My natural hair is either light brown or dark blonde.1