From Leopard Gecko Wiki
A Black Hole is a combination morph of one dominant trait (Enigma), one incomplete dominant trait (Mack Snow), and a recessive trait (Eclipse). The first Black Hole was hatched by A&M Geckos and debuted on Gecko Forums on January 26, 2007. With the Black Holes, the Eclipse trait blocks out the coloring the Enigma trait would show in the eyes so the eyes are a solid black. The body pattern of the Black Hole will vary because of the Enigma trait.