When I opened the box, I found the directions, several pairs of gloves, and one pre-mixed bottle. If you want really intense color, there is another Colorista product you need to use first, which I think is just peroxide bleach to lighten your hair. Using the lightener is a permanent change, and though the blue color in this product would wash out and fade eventually, you would end up with sort of pale blondish hair. I actually wanted more subtle color, so I put pigment over my own hair, with it's already pre-dyed blonde streaks. Be sure you read the box as well as the directions, there is more information on the box that I didn't see in the "use" directions.
I was happy to see the single bottle though, because it does simplify the test you can do to see if you are allergic. I know from experience I have a reaction to reds, but blues seem to be fine, so I just went ahead and used it--which I don't recommend, this is my own personality flaw :D
Even though I have used dye (and exclusively L'Oreal after two run-ins with Clairol) for years, this is a thinner mix and you need to take their instructions seriously about covering everything with a sacrificial towel or paper. This stuff is bananas--it flings everywhere. I was trying to use it out of the bottle, squeezing it on a plastic comb:
|A pile of pre-torn-off paper towels would have been good too.|
that has Sodium Laurel Lactylate instead of sulfate--the sulfate, according to K, is what strips out your color the fastest. Also it has argan oil, which people have been slapping on their heads since Victorian times (it's the "Macassar oil" that "antimacassar doilies" were intended to save chairs from). And it smells nice :D It's made my hair ends a bit softer, too.
Anyway, tl:dr read the directions and would buy again.