Beginning on 1 June 1960, the government introduced the second generation of ID cards. These bore the holder's fingerprint and photograph, and an official stamp. The information was typed, and the card was laminated. Males had a blue card and females had a red card. The format of card was replaced in November 1973 with a card without fingerprints. The colour of the stamp identified and differentiated permanent residents (black) from non-permanent ones (green). New immigrants subsequently became known colloquially as "green stampers" ().