==========[ "No-Revoke" Decks ]==========
=====[ ♥ ♠ ♦ ♣ ]=====
To expand a bit on what Mike posted earlier about "No-Revoke" decks:
In Bridge (and in many other "trick-taking" card games), a play in violation of the game's rules is sometimes called a "Revoke".
One of the most commonly-made Revokes is playing a card of the wrong suit (such as when a player must play a card of the same suit as the card which "led" - was first played in - a given trick). This often happens when a player mistook the suit of the lead card (usually mistaking it for the other suit of the same color).
To help avoid such revokes, decks were created in which the pips of each of the four suits is a different color.
Such decks are (optimistically) referred to as "No-Revoke" decks.
Most "No-Revoke" decks have white faces, but the black faces of the Arpak deck, by making the colors of the pips "pop", make it even more difficult to mistake a card's suit for another suit.
It should be noted that the colors of the suits can vary from one "No-Revoke" deck to another (for example, although clubs are green in the Arpak deck, they may be blue, for example, in another "No-Revoke" deck, and so on.)