B41M 5/48

Thermography ; {Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used } characterised by the base {backcoat}, intermediate, or covering layers, {e.g. for thermal transfer dye-donor or dye-receiver sheets}; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography combined with other image registration layers or compositions; Special originals for reproduction by thermography