A Koromo is a Kohaku style fish with blue or black edging added to each red scale. There are three sub types of Koromo; Budo Goromo have a blue edging outside of the scales that creates a grape-like cluster effect; Ai Goromo have blue edging only on the inside of the red scales; and, Sumi Goromo have black edging on the scales that can make the patterns appear almost completely black.