Mixing Medium is a clear gel that you use for more advanced eye shadow techniques- like foiling or wet lining.  If you're not so great at foiling give this one a try...instead of wetting your brush- just put a tiny little drop of this on your lid, and then press the pigment into place.  Much much easier than trying to get the color to spread smoothly.  You can also mix pigments directly into it for wet lining.  It's a thick gel (about like aloe vera gel from the drug store) so it's easy to control- no dripping, no running.

You get a 5 ml bottle- and that's going to last you pretty much forever- like at least a year if you keep the cap on it.  When it comes in the mail, you'll think it's tiny- like you got a sample size, but it's not a sample- you just need a tiny little bit.  It's clear, but there is a slight brown tint to it from the green tea extract.

Ingredients:  Distilled Water,  Sorbitol, Sodium Carbomerate, Gluconoactone and Sodium Benzoate, Green Tea extract.