I tested 4 different ways to engrave the same photo on slate coasters, and the result that stood out most was not the one I expected. In this video, I compare raw slate, sanded slate, lacquer, black acrylic, and my WWGB prep to see which one gives the best detail, contrast, and overall look. If you are trying to engrave photos on slate with better results and less guesswork, this video is for you.