Yes by rolling on a bench marker or by using contour blocks.
Yes, as long as the parts conduct electricity.
Not after anodizing. Mark deep before anodizing and the mark will show through after the process.
Yes, in most cases using low voltage, high pressure and proper electrolytes.
No, it may stain clothes but it will wash out. If you swallow it drink a lot of water and see a doctor.
An AC mark is around 0.0003 deep. A DC etch can go as deep as 0.005 or more but generally 0.001 is considered deep.
The dark mark is a combination of an etch and a plate.
Depending on the kind and use of the configuration and the depth required you can get from one to thousands of impressions.
Just free of sharp particles which would cut the stencil. Light oil is fine.
A reasonably smooth forged or cast surface
Yes, if not neutralized with the proper neutralizers.
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