"Monochrome Effect" (モノクロームエフェクト, Monokurōmu Efekuto) is the fourth single released by the Japanese techno-pop group, Perfume.Monochrome Effect is Perfume's second single after being signed to BEE-HIVE RECORDS, and fourth overall. Since their 2005 major debut, the single has gone out of print and is incredibly hard to find. It can be found on auction sites for more than five times its original price.