What causes THIS type of environmental damage?

It is evidently just stronger concentration of the chemicals. If you already have it, dilute it to a reasonable level ( I don't have a bottle, but if your says the concentration, we can extrapolate the strength) and try it. Just enough diluted to cover the coin with a little on top should give an idea how your dilution is working.

Like a friend of mine who dilutes liquid pool chlorine from 25% to 5% to use in his house. Saves him money

 

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I'll go take a look at it in a bit. The funny thing about the dilution/cost-saving is that the prices are "off" for the two products. I was looking online, and a 5oz bottle of the coin cleaner is $3, while the 10oz bottle of the dip is $3.50. There has to be a different chemical formulation, but I'll definitely post it after dinner.

Edit: I hate my coin store. They HAD the Coin cleaner in stock, so I picked that up just now. So much hassle! Anyway, I'll try the dilution suggested.

 

I "cleaned" it and the coin looks flatter now, but the majority of the color is still there. I guess the damage is here to stay.