Even though I started off on CGA, I never knew that the composite was much better. Oh well the things you learn far too late. But to be honest, EGA looked so much better, and sharper. Not to mention the Commodore Amiga on composite sets.
Virtually Fun
fun with virtualization
Wikipedia has a reasonable write up on the Composite artifact colors used in CGA and other systems – https://en.wikipedia.org/wiki/Composite_artifact_colors. I have a CGA card floating around with the Composite jack on it I’ll have to give it a go if I can find a machine that will fit a full-size ISA card in that is…
A similar technique was often used to do blending effects on consoles, especially in the 16-bit era. There’s some examples at http://retro-sanctuary.com/comparisons%20-%20differing.html and http://www.chrismcovell.com/gotRGB/rgb_compare2.html