Seeing that I am working today (Halloween), and felt too lazy to put a costume together, I decided that wearing some thick creepy black-and-red make-up would do the trick. Things you need to know about me : I rarely if ever wear colorful make-up; I own a ridiculous amount of colored make-up, because it's pretty; I (fairly) succeed in talking myself out of buying colorful make-up now - my drawers are full enough as it is.
For these reasons, I decided that buying a black base for the sole purpose of this black smokey-eye would be silly. That is why I used Mac's Blacktrack as a base.
I had my eye on Blacktrack for a very long while before I decided to purchase it, just because I already multiple black liners, either liquid or pencils. As it turns out, I adore this product as a liner - I find it easier to work with than a pencil (I have rather wrinkly eyelids) to draw a very thin line. I do set it with a black eyeshadow, but I don't think it's a necessity.
As a base, I have to say, it does a very decent job. The product is very smooth, creates a nice opaque surface, it's smudgeable (thus, blendable) and once it is set, it does not budge. A little goes a long way - you do not need to build a thick surface for the shadow to go on very black, and if you put too much, it will crease. Sheer it out, and you'll be able to rock your dark look all-night.