Ok! So, I have DARK red hair and I really like it. But, I wear a lot of light colours, so I decided to buy a lot of black, Because that is one of my fave colours! (even though it is a shade) So I decided, Wow, I would look nice with black streaks in my red hair, it will go with my new tutu,emo,scene, style! But... I don't know how to do it, I am going to use black hair dye, but I have a perfect 10 brush, and I was thinking of using that, I am kind of scared that it won't turn out, will the brush work?

Why don't you use a cap instead of a brush. It's way more accurate, and makes the streaks look more dramatic...