Spectrum Bridge by Cartamundi
Apart from the varied index and suit colours the deck is completely standard. Four-colour decks made for bridge or whist are often called ‘no-revoke’ decks and are said to help reduce eye strain, make it easier to sort your cards and reduce the risk of accidentally mis-playing a card. See the Box►
Above: Spectrum four colour Bridge by Cartamundi. Images courtesy Matt Probert.
Different coloured suit symbols had been patented in USA on Nov 23, 1926, by Antoine Lefebure of San Francisco, with the assertion that “even experienced players confuse clubs and spades; hearts and diamonds” here►