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[no_limits]

Does anyone know how to take this green hard corrosion off coins so that can see what they are or say I've tried lemon juice vinegar baking soda nothing seems to take it off

 

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[vpnavy]

While waiting for some suggestions - I moved this thread over to Research/Techniques > Cleaning & Preservation​

 

[Tpmetal]

i soak in distilled water, giving a very light brushing with toothbrush and changing water daily. can take weeks sometime to get that hard stuff off. though you don't want to remove it to bare copper, as you have done on the edges with vinegar and lemon juice, they leave it pitted and can destroy patina. The distilled water actually helps dissolve that mineralization. Its a long process but one that does not damage the coin.