Photo Engraving on Slate with a Diode Laser

How hard can it be right? WRONG!! Engraving photos on slate coasters with my Ortur Laser Master 3 diode laser using Imag-R and Lightburn software.
I explain how I went from substandard to sublime results, using material tests and output levels to fine tune my engrave. It's a bit of a long one but worth watching till the end to get a full understanding of how you to can improve you photo engraves on slate.