Ralph remembered how Atropos had slashed Rosalie’s balloon-string after the dog had licked his hand, and his hatred for this strutting, leering, complacently insane creature suddenly exploded in his head like a rotten-green roadflare. Source: Insomnia by Stephen King What is the literal meaning of rotten-green roadflare? Is rotten green a shade of green? Are road flares really green? Glossary: A flare, also sometimes called a fusee, is a type of pyrotechnic that produces a brilliant light or intense heat without an explosion. Flares are used for signalling, illumination, or defensive countermeasures in civilian and military applications. Source: Wikipedia. Thank you.