Wearing a hood. Zukin means 'hood', Kaburi means 'wearing'. Term used to describe Nishikigoi that have a head that is fully covered with colour. The Koi would not have Shiroji in the gills or in the lower jaw. Another terms for Menkaburi. Nishikigoi with heads covered in red are called Aka Zukin and Koi with heads covered in black are called Kuro Zukin. These Koi are not considered beautiful.
(Courtesy of the excellent Book Kokugyo Vol II)