Ruby Red Slippers is black Jelly base with Red hexagonal and various Glitter size in it. you need add 3 coats to get the full coverage, i recommend that you apply it as slow as you can, so you can get more glitter on you nails and don't forget to give a little bit time to apply the second or 3rd layers so you wont drag the glitters.
in this picture i added 2 coats of china glaze Ruby Deer as the base,and 2 coats of RRS. I did use a black onxy by OPI before but it's make the Ruby Red Slipper look darker and the red glitters ugly. so i change and decided to apply a red base, and it's loo stunning and pretty!
have a nice day