i have a couple of New Hampshire quarters that are really different both are made from a material that looks like tin as you can see on the one the center looks like red rubber and is not covered . i read where the mint was experimenting with different material in 1996 or . around there some where . looking for a new material for the new Sacajawea coin just wondering what i have thanks View attachment 1348004 View attachment 1348003 View attachment 1348003 View attachment 1348003
Try bending the quarter to see if it folds. I had a magic quarter that was cut in 3 pieces and the edge was cut in such a way that a rubber band was inserted to hold the 3 pieces together.
I'm not sure which coin is which, but that edge, whichever one that one is, was done with an acid strong enough to eat copper, but too weak to do much o the nickel. I find them roll hunting sometimes, it's how you make a "thin dime" except applied to a quarter. if you get it right, you lose almost no nickel, and it eats the copper core all the way through then you smash it flat.
wondering how acid could be so evenly administered on the edges to take the nickel off so smoothly and not get on the obverse or the reverse .the core has no marks or blemishes both sides are extremely thin all details very clear weighs 5.4 grams the second coin weighs 5.6 grams
Depending on the environment, some acidic or basic solutions can react with the copper core much faster than the cupro-nickel alloy cladding.
You soak the whole coin. The acid used attacks the copper more readily than the coppernickel. Vinegar would work.
