Multicolor image forming material and method of multicolor image forming method

1. A multicolor image forming material for laser heat transfer, comprising an image receiving sheet containing an image receiving layer and at least four heat transfer sheets having different colors including yellow, magenta, cyan and black each containing a substrate and at least a light-heat conversion layer and an image forming layer provided thereon, wherein Ra and Rz showing a surface roughness of the image receiving sheet satisfy the following relationships 3≦Rz/Ra≦20 and 0.5 μm≦Rz≦3 μm, and wherein the surface roughness of the image receiving sheet is formed by Benard cells.

2. The multicolor image forming material according to claim 1 , wherein the image receiving layer of the image receiving sheet is formed by using a liquid coating composition for image receiving layer which contains an organic solvent having a boiling point of 70° C. or lower in an amount of 30% by mass or more based on a total organic solvents employed and has a viscosity of 15 mPa·S or more.

3. A multicolor image formation method using a multicolor image forming material comprising an image receiving sheet containing an image receiving layer and at least four beat transfer sheets having different colors including yellow, magenta, cyan and black each containing a substrate and at least a light-heat conversion layer and an image forming layer provided thereon, the method comprising the steps of: superposing each of the heat transfer sheets being on the image receiving sheet with the image forming layer facing the image receiving layer; and irradiating with laser light to transfer an irradiated area of the image forming layer to the image receiving layer to record a multicolor image on the image receiving sheet, wherein the multicolor image forming material is a multicolor image forming material according to claim 1 .