MULTICOLOR PRINTING BY LIQUID-CRYSTAL INK

PURPOSE:To obtain a printed matter showing the same colors as those of an original at the time of reaching a certain set temperature, by subjecting the original to color separation to form positive films, forming printing plates by using the positive films, printing by using the printing plates and applying red, blue and yellow liquid-crystal inks particularly to white-colored areas. CONSTITUTION:An original is subjected to color separation to form positive films, and laying the positive firms on each other to form a white printing positive film for printing white-colored areas. Substrates are coated with a temperature indicating material which, now being in an undeveloped state, will be developed into a black color at the same set temperature as that for liquid crystals used in multicolor printing and capable of exhibiting respective colors when the set temperature is reached. With the positive films used for the substrates, respective printing plates are made based on the color separation, and multicolor printing is conducted by using the printing plates. For the printing, inks are used which are prepared by mixing each of the liquid crystals with a binder. Particularly, white colored areas are coated with red, blue and yellow liquid-crystal inks in a laminated manner.