I know i have other topic with same thing .Here I have example before and after silver
denarius with lead deposits cleaned with ammonia
the result is lead is gone copper stays .
Do NOT USE THE WRONG SUBSTANCE
For COPPER use lemon juice
For Lead only use ammonia
Ammonia is toxic use only outside and for lead deposits. Dip the coin in
glass jar with ammonia just enough to cover the coin close the lid "Ammonia will evaporate if you don't close the lid "
Every 15
min check the coin rub with fingers until you like the result DO NOT OVERUSE AMMONIA IT WILL DAMAGE THE COIN "
In my case for this Vespesian the coin was in ammonia for 3-4 hours and i was checking it every 15-20
minStep 2 is to use lemon juice to remove the copper deposits which im not going to do just because i think the coin looks great with them .