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 Replies: 22 / Views: 3,498 |
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Pillar of the Community
1325 Posts |
dioxide.. thus it is oxidizing the silver. silicon used for semi-conducters...Silicon Valley...
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Valued Member
 United States
99 Posts |
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Pillar of the Community
United States
1215 Posts |
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Valued Member
United States
99 Posts |
Im thinking its the quartz itself
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Pillar of the Community
United States
1215 Posts |
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Bedrock of the Community
United States
10045 Posts |
Quote:
You know, you only need a little sulfur to have a lot of effect. Yeah--it doesn't take much; I doubt you would even need to smell the sulfur dioxide or hydrogen disulphide. I've got silver vessels that tarnish to near black in 6-8 months. Quote:
dioxide.. thus it is oxidizing the silver. Quartz is already oxidized silicon--it is not letting those oxygen go; they won't oxidize other things.  Edited by DVCollector
12/14/2014 9:29 pm
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Moderator
 Canada
10463 Posts |
Quote:
But it's a natural quartz cluster. It has a strong affect on the coin for sure. Nope. While quartz crystals do have piezoelectric properties, it basically is chemically inert (hence why it is so abundant in the Earth's crust, and occupies the lowest potential to weather in the Goldich dissolution series). What is toning your coin is whatever it is being exposed to in the air and environment you have it placed in. Humidity, exposure to sunlight, air quality all are playing a role in toning of the coin. Lots of people believe that quartz crystals have all kinds of special "powers"... but as a geologist, I think it is pretty much a shovelful of the finest fertilizer... "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Valued Member
United States
99 Posts |
Why would the top of the coin tone faster than the bottom?
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Pillar of the Community
Canada
2520 Posts |
Less air getting to the bottom because it's resting on the quartz and not seeing as much molecules as the top part which sticks out.
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Pillar of the Community
Australia
3831 Posts |
I think you are assuming you have "pure" quartz.
Whether you like it or not, how can you be certain that when you obtained the quartz mineral, the surface was free from contaminants? Did you rinse it with water? Acetone? All you need is trace amount of sulfur for silver to tone.
My partial coin collection http://www.omnicoin.com/collection/gxseriesMy numismatics articles and collection: http://www.gxseries.com/numis/numis_index.htmRegularly updated at least once a month. |
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Valued Member
United States
99 Posts |
I soak my quartz in cold water once a month then towel pat dry.
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Moderator
United States
23522 Posts |
It's toning from the top because that's where the chemicals toning it are coming from. The quartz is protecting it.
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Valued Member
United States
99 Posts |
They say quartz does have protection qualities! :)
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Moderator
United States
23522 Posts |
That's enough toning after only 4 months to make me wonder about the atmosphere in the room. Is the table upon which it sits new? I found out the hard way about that one.  |
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Pillar of the Community
United States
1314 Posts |
Would the crystals break light into various frequencies (Newton's prism - see humor) with some light causing the silver/copper alloy to be more reactive with the environment? Or conversely, creating a frequency that makes something in the atmosphere more reactive to the metal? Just thinking out loud. Neat basis fr some experiments.
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Replies: 22 / Views: 3,498 |
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Posted 12/14/2014 8:59 pm
