The pink coloring that is being refered to, is actually from the effects of sunlight on the OD colours applied to early US aircraft. After a short time in the North African sun (also in the High Arctic Summer) the OD pigments used in the early paints would fade to a "pinkish" hue. This coloring was quickly realised as the benefit that it was, and how well it bleded in, and was appiled to other aircraft as a "pinkish" hue.
Oweing to the desire for more speed, paint was generally adhorred late in the war, as pilots sought every advantage, and manufacturers cut every corner, so painting, both interior primers, and exterior camoflauge was obsolete.
NOTE ** Ms. Parrish's aircraft wears a gloss pink, which was NEVER applied to US fighters.