1966 Dime-Core Only-Missing Copper-Nickel Layers!

Understood. All I can say is that all acids are not the same. My thoughts are that certain acids will react differently with metals, and they will "attack" different metals more aggressively depending on the chemical properties when they meet.

Sulfuric acid is a strong acid, but there are much stronger out there that people have access to. Sulfuric is just probably the most common name out there. Hydrocloric, Hydrobromic, Nitric are all strong acids, and they all have different chemicals in them that may react differently than others. It's been a long time since chem classes, but hopefully you get my point. I think as you go right and down on the periodic table the acids increase in strength. At least for the strong acids. Biochemist should be able to straighten me out if I'm wrong here.

Keep in mind there are also very corrosive acids that are not considered strong acids that can probably do some damage as well. I think hydroflouric was one that would actually dissolve glass.