yeah, Mixing Medium is an awesome thing to have. It's especially good to use with Lustures. I just drop a bit on the back of my hand, dampen firm brush like the 242 or 252 (just a little bittt) with it and then pick up some eyeshadow and apply. I think it makes them go on less chunky and look less flakey.
with pigments, I like to drop a little MM on the back of my hand, get some pigment on the brush, and then mix them on the back of my hand. I use MM mainly with Matte pigments, since they are easier to go on when wet. And Chunky pigments (like Rose and Steel Blue) and it makes them go on like the color in the jar. Not a grose glittery mess.
but honestly...I think someone told me that Mixing Medium is just distilled water...which would be a real shame considering you can get 500000 gallons for 2 dollars at walgreens.
Eyeliner and Mascara mixing mediums are gels. they are really nice, but I notice that after a few hours, they begin to flake :-(
then there is Mixing Medium for the body and Mixing Medium gel, which I think are for super professional use.
oohh sorry I wrote so damn much haha! I just really like this stuff, and pretty much all pro items are awesome!