1mm pure titanium color engraving sample

Information

      I think color engraving is generally done on stainless steel.
However, the types of stainless steel are unclear.
When purchasing a new plate, we choose one that allows us to confirm the type of stainless steel it is and use it as the material for color engraving.
The problem with color engraving is the reflectivity of the material.
That's when I came up with the idea of ​​titanium.
I own many parts made from pure titanium and Ti6AL-4V.
So I spent a considerable amount of time researching various parameters and conducting color engraving tests on expensive pure titanium plates.
Here are some of the results, although they are only photos.
Google Translate