What does pseudo color mean?

Property: color film that makes the subject produce illusory color reproduction. Includes: (1) multilayer color films (multilayer masks, intermediate negatives and infrared aerial photographs) whose dyes are independent of the colors in the spectrum sensitive range, such as Ektarom infrared aerial photographs, which are used to observe the distribution of plants, the infrared sensitive layer produces cyan, the green sensitive layer produces yellow and the red sensitive layer produces magenta; (2) A film (X-ray film) in which the difference in transmittance is expressed by dyes; (3) In order to record scenes with a wide brightness range, multi-layer color films (XR films) with different colors and sensitivities will be produced.