What color is the crayon in homer simpsons brain?

Homer had a powder blue crayon lodged in his brain. In the episode HOMR, Homer found out that he had a crayon stuck in his brain from when he was a child. After having it removed from his head he displayed a large increase of intelligence, but he later had another one lodged into his brain up through his nose by Moe Szyslak who described the procedure as "the old Crayola oblongota".