No, you need to purchase a developer

Level 40 Volume developer, because you need a high volume to be able to lift your dark hair, otherwise it may not show up very well or it may not be the desired color, I got pink, not sure what color you have, for example if you don't have a high enough volume developer and you bought the pink, it could come out on the orange side rather than pink. I'm not sure how much parts you are suppose to mix, you need to refer to the bottle of developer,and possibly the flare box to see the required AMT of developer you will need. Another suggestion is to bleach it out some first with a high lifting bleach, then you can use a 20 volume developer with the flare instead. I hope this helps some. Good luck..

I know this is an old question, but please no one do this. If you have dark brown hair, you could even go up to 40 volume + color (don't do this, you'll break your hair off and burn your scalp) and without a lightener (bleach) if you're very, very lucky, your hair will just continue to look brown. When the color fades you'll be left with (likely damaged) brassy hair. If you have natural dark hair and don't want to lighten it, use a semi-permanent or any color which does NOT use a developer. Your hair will look a bit darker than your natural color, but your lighter hairs will show a bit of the color, and you'll see the tone when the light hits it. My natural color is level 4-5 and I've tried doing my outgrowth with 40 vol and color instead of pre-lightening: it's bad. It just turns orange. Dark hair, even if you have the least red hair you've ever seen, still has a red undertone. When you lighten it, you have to lighten it a LOT (like level 8-9) to get the red out, and you still have to tone it to get the yellow out at that level. Developer alone can only lift about 1 level max, so you're going to get very, very orange hair if you put that on dark hair. Blue and orange makes brown, and if you somehow do get a level of lightening that is closer to yellow than orange, the best you'll get is green. You will never, ever get blue from a permanent color if you don't pre-lighten dark hair. If someone tells you otherwise, demand proof.

Just don't mix the color with developer and it'll keep pretty much indefinitely with the cap on in the original tube (I've been known to have an open tube of color for a couple months with no problem). Once you mix with developer, it's usually only active about 30 minutes. So even though you might have some leftover mixed color, it won't do anything if you apply it to your hair.

No it only alters the color, it's a permanent, and must be used with a developer, 20, 30, or 40, depending on how much lift you need.

No you can't, you have to add a developer, 20, 30, or 40 volume, there are other products out there like ion neon or pastels, they are semi permanent, and you add nothing. No chemicals and non damaging, to hair.

You have to mix it with developer. I used Ion sensitive scalp creme developer to mix this with.

Either devoloper would be fine, 40 going to lift faster, so check sooner on your hair.