composite color signal
composite colour signal
composite color sync signal
composite colour sync signal

Luminance (derived mathematically from the composite color signal) takes the place of the original monochrome signal.

The intense versions of these colors can also be used and the background color may be changed, but the palette cannot be switched to official palettes 0 or 1 without enabling the composite color signal again.

That portion of the composite color signal, comprising a few cycles of a sine wave of chrominance subcarrier frequency, which is used to establish a reference for demodulating the chrominance signal; Normally approximately 9 cycles of 3.579545 MHz.