How can I develop more?

I heard it is usually 20 or 30 vol., but how can you tell which is which?

I am 19 years old so for the most part im finished with my development I think lol, but I want to know what kind of shape I h...

I have a lil sister and she has started to develop breast or lumps from puberty you know what I mean deal is she gets these t...

I have 3 packets of clariol pro lightening activator powder to mix in it. I will be using a cap to lighten dark alburn hair....

I want to lighten my hair, but the color I have will not do the trick so I am trying to see if I use a stronger developer if ...

I got my monroe piercing like 2 months ago and I started developing a small bump right on my piercing outside of it. Looks we...

I am looking at bleaching my hair. I would like to know what bleaches/lighteners, developers and toners you would recommend, ...

How much developer do you use when using loreal hicolor for dark hair? The color is h16 honey blonde and the creme is 30 vol....

About a year ago I started growing like a black dot on my cheek but like I've never had anything but freckles there before. i...

I just started myperiod last month, and I have boobs but why arent they fuly developed yet> and dont boobs grow more wehn you...