Yes, bleach or a high lift color mixed with 30 vol. developer is needed in order to lighten hair.
30 volume developer will lighten the hair three levels.
It will remove the pigment from your hair and lift your hair color 3 times (lighten it).
No you need the powdered bleach with the developer.
No. Using a developer by itself will only open the hair's cuticle. You will need bleach or a high lift color, in combination with a developer, to actually lighten it.
for pre colured hair if dark brown you can use 2 no less colur with 30 vol and streaking powder
semi-permanat colours will not lighten hair due to them being a dye not a bleach. but when using a permanant colour , your hair can be lightend some, depending on which volume of devloper you use, 10(deposit only no lift) 20(lifts 2-5 shades then deposits) 30(lifts 4-8 shades then deposits) but for safety and healthness to your hair i wouldnt recommend using over a 20 devloper.
Yes, this will work, but I recommend using 20 volume developer instead of 30 volume and watch the hair closely.
Depending upon the desired amount of lift, 20 or 30 volume developer should be used when lightening the hair. 20 V. will lift 2 levels and 30 V. will lift three levels on virgin hair. 40 Volume is not recommended.
To naturally lighten your hair at home, you can use a mixture of lemon juice and water. Apply the solution to your hair, then sit in the sun for about 30-60 minutes to enhance the lightening effect. Alternatively, a mixture of honey and conditioner can also help lighten hair over time when used regularly. Always do a patch test first to avoid any adverse reactions.
10 Volume developer has a minimal amount of lift and is not recommended for lightening hair. Try using 20 or 30 volume instead.
depending on how many tones away you want to get from the color you have now. If you are going lighter you will want to use a 20 (30 is fine too if you are trying to go over 3 tones but be careful as it will dry your hair out more) otherwise if going darker you'll want to use a 10
Get some real lemon juice and spray it all in your hair. Stay out in the sun for about 30 minutes to an hour. Wash your hair a few times and condition it well. It will dry up your hair!