The Incredible Hulk is usually green but ... he was a simple grey color. Grey Hulk was the first to manifest after Bruce ...

Our final color of Hulk is no color at all ... still in human form (see Bruce Jones and Mike Deodato's Jr.'s Incredible Hulk Volume 2 #50), suggesting he too qualifies for the 'skin-tone Hulk ...

in times of extreme anger, he transforms into a huge, incredibly strong green creature, who has been given the name "The Incredible Hulk".