Magic Tricks

If you understand the basic plot and workings of the "Oil and Water" concept, then, I would recommend David Solomon's version "Technicolor"
http://www.penguinmagic.com/p/789
The additional layer with different colored faces combined with different colored backs makes this one unique, in my opinion.
If you're just learning your first oil and water routine, any of the inexpensive, beginner versions will work fine for you.
Technicolor will take practice.
Enjoy whatever you choose.

Although it's not a direct answer to your question, you may appreciate magician Mahdi's Oil and Water routine, with which he successfully fooled Penn and Teller: https://www.youtube.com/watch?v=tmOdOMt48rM

Thank you.

I just viewed Mahdi's amazing magical talent! Thank you for the reference.

Nathan