Pretty much anything not covered by the topics above. Short lived production bikes or vehicles, Electrical, Tires, Paint, Brakes, etc. Use this for tech questions, and "Shoot the Bull" for general conversation, no tech.
When you see something appear, stop the acid with baking soda and rinse. Scuff the surface with Scotch-Brite etc. to see what you have. If too faint, repeat.
This will not work if the numbers have been completely ground off to roughly 2.5 × the impression depth (.150"?), starred or X'ed over, or welded.
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