METHOD OF INK-JET PRINTING WITH COLORLESS SOL-GEL INK OF IRIDESCENT HOLOGRAPHIC IMAGES ON HOLOGRAPHIC PAPER OR MICRO-EMBOSSED SURFACE AND PRINTED PRODUCT WITH IRIDESCENT HOLOGRAPHIC IMAGES Russian patent published in 2017 - IPC B41M1/14 

FIELD: printing industry.

SUBSTANCE: first, on the holographic paper or on the micro-embossed surface the optically transparent images with a refractive index of more than 1.7 throughout the visible light spectrum are printed with the sol-gel ink containing titanium dioxide nanocrystalline sol in ethyl alcohol solution in water after drying the noted sol-gel ink. Second, topographic paper or micro-embossed surface with the optical transparent images with a refractive index of more than 1.7 printed with sol-gel ink is covered with optically transparent polymer or lacquer with a refractive index of less than 1.6 with creating of the optical masking effect of holographic paper or micro-embossed surface areas free of images printed with sol gel ink and selective display of rainbow holographic images printed with sol-gel ink.

EFFECT: creation of a technologically simple, fast inkjet printing with conventional inkjet printers of unique and individual colorful rainbow holographic images, which do not fade under sunlight and UV-radiation.

9 cl, 8 dwg, 1 tbl