The Collaborative International Dictionary of English v.0.48:
Chromatype \Chro"ma*type\, n. [Gr. ? color + ? type.] [1913 Webster] 1. (Photog.) A colored photographic picture taken upon paper made sensitive with potassium bichromate or some other salt of chromium. [1913 Webster] 2. The process by which such picture is made. [1913 Webster]