Here’s a thread you might find helpful.
How thick is the metal you’re using?
To mark (not engrave), requires you to heat up the metal to a certain temperature to create an oxidation or annealed area. Some of these marks will disappear at certain light angles, some will not.
Material type, thickness and even ambient temperatures can change what colors you get as all of these determine surface temperature.
I got very little changes until I started using q-pulse, but mostly interval to dial in the colors.
Metal sinks heat away, so thickness and ambient temperature can cause changes in the finished operation.
Using a 160mm lens, the spot size is near 25 microns, but they are using a interval of 3 microns.
Good luck
