1) Black and blue 1) Dichromatic 
• (a.) Furnishing or giving two colors; -- said of defective vision, in which all the compound colors are resolvable into two elements instead of three.
(di-kro´mik) having, or pertaining to, two colors.
Di·chro'mic adjective [ Greek ... two- colored; 
Type: Term Pronunciation: dī-krō′mik Definitions: 1. Having, or relating to, two colors.
pertaining to or involving two colors only: dichromic vision.