Color perception in meditation
The most colorful sutta is MN77 Mahāsakuludāyisutta.

Not perceiving form internally, someone sees visions externally, blue, with blue color, blue hue, and blue tint.
Not perceiving form internally, someone sees visions externally that are yellow, with yellow color, yellow hue, and yellow tint
Not perceiving form internally, someone sees visions externally that are red, with red color, red hue, and red tint.
Not perceiving form internally, someone sees visions externally that are white, with white color, white hue, and white tint.
(etc.)

AN10.29 is the second most colorful sutta.