I saw an intriguing video about an alternate method of doing the Norton tile method: instead of coating the tile with white spray paint, you use cold galvanizing compound (like this stuff: https://www.homedepot.com/p/Rust-Oleum-Professional-20-oz-Flat-Gray-Cold-Galvanizing-Compound-Spray-7585838/100142963). Basically it’s just powdered zinc in a spray can. The advantage of this method is the unlasered bits just wash off in a stream of water with a little scrubbing.
I decided to give it a try. Here’s the tile along with the image I used.
Not a great test, the image I used was way too contrasty. But i like the rich brown tone I got, and I think the method has promise. I’d love to see others’ results if you give it a go.