Which Color Has the Most Difficult Time Overcoming Its Limitations? My favorite course to teach here at Color Code International is our Trainer Certification Course. The program is available to people who want to really study and understand the Color Code so that they can then teach our workshops. During one of my most recent classes, the following question was asked, "Jeremy, which Color has the most difficult time overcoming its limitations?" Curious as to what the trainer-in-training was thinking, I asked what he thought the answer was, and a wonderful debate ensued. He said, "I think Reds have the hardest time overcom