Unquestionable observations: optical characteristics of the cloth:

A021) The cloth shows bands of slightly different colors of yarn that are best observed in ultraviolet photographs. For example between face and hair there are two non-colored bands that continue along the warp direction (Miller and Pellicori, 1981, Fanti 2003, Rogers 2002, 2005).
A022) There is a correspondence (even if not complete) between cloth bands of slightly different colors of yarn of the front and back surface (G. Ghiberti 2002; Fanti 2003).
A023) The colored fibers in non-image (background) areas show the same type of superficial color as body image fibers, their spectra are the same, and the cellulose in them is not colored (Gilbert 1980; Rogers 2002).
A024) The body image does not fluoresce in the visible under ultraviolet illumination (Gilbert 1980, Pellicori 1981).
A025) The non-image area fluoresces with a maximum at about 435 nanometers (Pellicori 1981).
A026) A redder fluorescence can be observed around the burn holes from the AD 1532 fire (Pellicori 1981).
A027) The cloth does not show any phosphorescence (Rogers 2005).
A028) All the chemical and microscopic properties of dorsal and ventral image fibers are identical (Jumper 1984).
A029) An emission image was clearly visible in the 8-14 micrometers infrared range (Accetta 1980).
A030) IR emission of the image at a uniform room temperature, and in the 3-5-micrometer range was below the instrument sensitivity (Accetta 1980).