Abstract: The invention comprises a method for providing a multi-colored, long-lasting engraved mark on the surface of a brick or other similar ceramic object. Masks are used to separate coloring agents during the engraving process such that variegated designs may be created. A groove may be placed in the surface of the brick over the area to be engraved to provide a substratum for the coloring agent. The coloring agent is placed in the groove and subjected to heating such that it melts and fuses with the underlying brick surface within the groove. The coloring agent is comprised of colored glass frit particles. A laser is optimally used for providing both the grooving and the heating steps.

Abstract: A process is provided for producing contrasting, long lasting, glassy heat fused images on the surface of ceramic materials such as bricks using a laser to vitrify the substrate material. The process is accomplished in three stages: Stage 1) the laser produces a non-adherent, highly light absorptive layer by heating and removing material from the marking field to create depth into the brick's surface; Stage 2) melting of the main portion of the substrate material along the marking field using the non-adherent light absorptive layer from Stage 1 as an effective light absorber/heat transducer to cause vitrification along the marking field; Stage 3) residue from the melting in stage 2 is removed by laser ablation to produce the vitrified finished mark.