The switch from orthochromatic film, however, was only gradual. Images were made on orthochromatic photoemulsive film or plates. Two orthochromatic films were added in 2018. One records the color red (via a dyed panchromatic film), and the other, blue (orthochromatic). Each manufacturer had previously offered one negative stock (usually orthochromatic) and one print stock. Specifically, Howe made Mary Miles Minter's blue eyes register on orthochromatic film with a filter. When stained with cresyl blue, the hyphae turn dark blue, indicating an orthochromatic reaction. Kodak discontinued manufacturing general-purpose orthochromatic motion picture film in 1930. In photography, an orthochromatic light spectrum is one devoid of red light. The front film was a red-blind orthochromatic type that recorded only the blue light. Monochrome film is usually panchromatic; orthochromatic has fallen out of use. The front film is orthochromatic, to record the blue-green portion of the picture.