It is Nordic Gold so I guess the copper part should go green like it even does on 0.900 gold in spots ( but acetone takes it off the gold in 24hrs
since it has no staying power )
I will take the ultimate test and put it in a ticket vending machine
This measures diameter and torerances and thickness and conductivity and weight
It may fail on conductivity in which case I will dump it in destop ( 20% calciumhydroxyde )
There are oodles of false euro coins around especially in the two euro catergory but if this is not a false one it is a spending one