BLACKEST NIGHT #0, which hits on 5/2 (Free Comic Book Day, meaning it is, yes, free at participating comic shops) provides readers with the first concentrated glimpse at this summer's mega-event, from writer Geoff Johns and artist Ivan Reis. As we move closer to BLACKEST NIGHT #1, we thought it'd be helpful to give readers a quick course on the spectrum of colors populating the universe and wielding power rings of varying power levels and emotional focus. Here, to kick things off is a two-page spread from incoming GREEN LANTERN artist Doug Mahnke, with the quick basics on Hal, Kyle, Guy and more. bnln_glspread