That seems like a very primitive technique. I doubt this was what the ancient Egyptians used to carve e.g. the https://en.m.wikipedia.org/wiki/Rosetta_Stone#/media/File%3A... or https://upload.wikimedia.org/wikipedia/commons/0/09/Mernepta...

I sometimes think they might have used some kind of acid (maybe in combination with sunlight) like modern https://en.m.wikipedia.org/wiki/Photolithography .