I have many HSS lathe turning tools that I picked up at a local swap meet. Most of them have been ground for a particular use on the lathe and since they have job names and numbers labeled on them I assume they were used in a production setting. My question is how do you label the shanks of high speed steel tool blanks ? I posted a picture of a few that have been labeled and I want to know how to do it. I have a hand held electric engraver and obviously it will not touch HSS. I am not sure if you need a carbide tip for the engraver? Please take a look at the picture and tell me how they etched or engraved them. The lettering appears to be black in color and somewhat raised. I have tried to sand it off and it seems like it is deep into the surface.