Considering how many tattoos I have and where they are on my body, I think I can safely say his chart is at least half innacurate. Everyone experiences and tolerates pain differently. My foot, hips and finger did not hurt at all whereas my thigh was complete 6-hour torture... almost as bad as the "Pass Out" blue color. Also, the back of my upper arms where much more than "Irritation." The under arms, rib cage and calfs seem fairly accurate, though.