I had an AtomStack A40 Pro that I used to mark ceramic tile after coating with black marking spray. The design would come out black. I recently upgraded to an Atomstack A70 Pro and using the same process the tile now comes out gold or more of a light grey color. Tried different speeds and power with the same results. I’m guessing has something to do with the frequency of the laser being different on the newer machine. Positive results is with the new machine i no longer have to use the black marking spray to engrave tile.
Try with spray without air-assist.
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