Author Topic: Using pollution  (Read 1751 times)

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Offline Figleaf

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Using pollution
« on: April 15, 2007, 10:01:20 PM »
You must have seen them, those harsly cleaned coins, shiny like Aunt Mildred's silverware and not a trace of patina. Here's my favourite recipe. I leave them on a windowsill for a number of years. Each year, they get turned around. Where I live, the air is not very polluted, but silver coins are back to normal in about 3 years. Copper takes a litle longer to return to milk chocolate brown, but it gets there. I learned this trick from famous Amsterdam dealer Jacques Schulman. Jacques lived on one of Amsterdam's canals and his shinyware got enough sulphur to get back to a normal colour in about a year. The wonderful thing is a) harsly cleaned coins are a lot cheaper and b) you now have an official reason to procrastinate. Just make absolutely sure your loving wife doesn't clean the dirty old coins for you. ::)

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.

Offline bruce61813

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Re: Using pollution
« Reply #1 on: April 16, 2007, 05:33:42 AM »
That's not a trick, that's how they got to be that color the first time. People assign 'grren' to age, when the real surface color keeps turn darker brown until it reaches a black. The green oxides require water and other chemicals. But this is one of the things I have advised for some time now. It is good to hear others recommend it.

Bruce