Almost black colour
The RGB colour model is an additive model in which the red, green, and blue primary colors of light are added together to reproduce a broad spectrum of colours. In the case of almost black, using 8-bit 0–255 values for each channel, it is red 40, green 40, blue 40.
The CIELAB color space expresses color as three values: L* for perceptual lightness, and a* and b* for the colours of human vision: red-green, blue-yellow.
‘Almost black’ is used as the black in the YouTube logo.
In terms of colour temperature, almost black is considered a warm colour.