According to this article: color influences the type of memory that one associates with the data one is trying to remember. Blue gives the viewer a sense of safety and creativity, while red gives a viewer a sense of urgency and triggers memorization of details to a greater degree.
I have always been triggered by these colors on a very conscious level. I can even remember not taking a teacher’s comments on a paper or test seriously because they wrote in blue or black ink. The teachers that used red ink always got my utmost respect, and more attention from me than those who didn’t. I even remember being very cautious of any professional, teacher or co-worker, that carried those multi-ink pens..almost as if they were going to switch personalities on me in a split second.