The "original" Carte Blanche was launched in 1964 (AFAIK) as a high end charge card. The card was white, and had its own acceptance network.

Citicorp acquired Diners Club, and a few years later Diners Club acquired Carte Blanche (at the beginning of the 80s) , but did not really promote the product. DC stopped Carte Blanche (but existing cardmembers could keep their account : 25,000 accounts remained in 1997).

The "new" Carte Blanche has been launched by Diners Club US a few years ago (in black) as a concurrent product of Amex Platinum charge card.