I read this on the Cermark site:
CerMark Tape for Brick Applications
Did you know the CerMark Tape you use to create black en-
graving on metal using a Co2 laser is also great for marking
clay bricks? The heat energy of the laser will fuse, or therm-
ally bond the CerMark resulting in a very permanent, black
engraving bonded to the clay brick.
Has anyone tried this? And is it true you can only use the tape with high power lasers? I only have a 35w Epilog Mini - I wonder if it's worth buying the tape.