Unusual types of gramophone records vinyl colors became too high, but the different colored labels were continued, at least for popular music (black) and classical (red, as in "Red Seal"). In October 1945, RCA Victor put on the market its first "non-breakable" phonograph records. Made of a ruby-red, translucent vinyl resin plastic, they cost twice as much ($2 per disc) as the 12-inch Victor Red Seal. In the 1960s, a distinction was made in label colors of promotional copies of 45 RPM records as well, with pop music being issued on yellow labels and country on light green. In the 1970s, such gimmicks started to
Spelling of disc in British English. The earlier word is "disk", which came into the English language in the middle of the 17th century. In the 19th century, "disk" became the conventional spelling for audio recordings made on a flat plate, such as the gramophone record. Early BBC technicians differentiated between "disks" (in-house transcription records) and "discs" (the colloquial term for commercial gramophone records, or what the BBC dubbed CGRs). By the 20th century, the "k" spelling was more popular in the United States, while the "c" variant was preferred in the UK. In the 1950s, when the American company IBM pioneered the