The only thing that will occur when using 30 V. developer when coloring a dark color is that the color will not take as dark as it should. It will probably turn out to be a little lighter than expected.
To cover gray hair and dye brown hair dark blonde, it's recommended to use a 20 volume creme developer. This strength provides enough lift to lighten the hair slightly while also covering gray effectively. Be sure to follow the instructions on the hair dye kit for best results.
It will lift colour three levels above a base 6 (dark blonde) and it lighten hair two levels below a base 4 (brown).
you need a 10 or 20 developer. Nothing higher. Since your going from light to dark you dont need to use a strong developer to lift color out.
This is difficult to answer without seeing your hair and knowing its texture and whether or not there's any presence of artificial color. With that said and for the most part.... yes, 30 volume would be better to use than 20 volume for a blonde shade.
It depends on how light you want to lift the current color in your hair. For light colored hair such as light brown to a normal dark brown you can use a 20. But if your hair is a very dark brown that looks almost close to black you would use a 30 or maybe even a 40 if it's really dark. A 20 developer will lift your hair color twice as much and a 30 developer,3 times as much. Lifting means making it lighter. You can watch the color as it processes and once it reaches the desired lightness you rinse to make it stop processing. Most hair dressers start with a 20 volume developer but it still depends on the current color of your hair.
No, it would be preferable to use 20 volume developer when going from dark brown to black hair color.
10 volume is if you want to go dark with color but with bleach 10 vol gives you one level of lift but if it seems slow to you use 20 volume, never use 30 vol or 40 vol on scalp it will irritate it.
The difference between the volumes of developers is that 20 volume gives 2 shades of lift, and 30 gives 3 shades of lift. If you are coloring you your hair darker than your natural hair you want 20 volume and also if your only going up 2 shades of your natural color you would use 20.
Use a 5N (Neutral) + 10 Volume developer. If there are any grays present, mix color with 20 Volume instead.
30 volume developer, or peroxide, will successfully lift naturally dark brown hair, resulting in nice highlights.
for pre colured hair if dark brown you can use 2 no less colur with 30 vol and streaking powder
It depends on how dark your current color is and how light you want to go. Try using 30 volume. It's strong enough to do the job but won't kill your hair the same way a stronger developer would, as long as it's used properly. If you're hesitant, try seeing a stylist.