ABOUT OIL AND HOT WATER

A named four of a kind is removed from the deck. They are mixed red, black, red black before they somehow seperate. This is done once again and somehow they seperate. The effect is performed again but this time with two cards face up and two face down. Even so, they seperate! It's then shown that whilst the deck they came from is red backed, the four cards have a blue back! Finally, all the backs turn back to red!