[munificent]

I love that color too. Fun trivia that I discovered doing pixel art way back then: That color is blue.

It appears purplish, but it's actually a desaturated blue with hue right at 240°. Something about the lack of saturation and brightness gives it a purplish cast.

[tobr]

It’s funny how mixing pure blue (#0000ff) with pure white (#ffffff) makes it look a little purple, and how you also have the exact same problem when you invert the colors - mixing pure yellow (#ffff00) with pure black (#000000) makes it look sort of green (the complementary color to purple). In both cases you have to adjust the green channel a little “faster” and the red a little “slower” to get something that looks more neutral, ie shift the light blue towards cyan and the dark yellow towards red.

[psczvnadfjk]

That seems similar to the "perwinkle blue" that was used as the default background in Apple IIGS ProDOS16 / GS/OS. In that case it was done with pairing white pixels with blue pixels.