Oil & Water Rainbow by Paul Gordon

Nine red-backed cards are shown to be black-faced (say, black Kings) duplicates. They are mixed (alternately) face up and face down. They magically separate. Using different moves, it's repeated! Finally, half the cards are shown to have blank faces (first kicker) and the other half are shown to have four different colour backs. This second kicker is a total applause-getting surprise!

"Excellent Paul. Great ending that'll 'floor' them."
- Aldo Colombini

You end clean (all can be examined) and the rest is instant!
Semi-advanced routine using standards moves.

Full instructions (with photos) and the special set of nine cards are included.