Many studies show that the majority of verdigris is copper carbonate which is a bluish green compound with similar color to 'bronze disease' as...
By what ever name you wish to use, it is copper corrosion. The coin in its lifespan of 125 years, ( during much of which coin protection of modern...
I would think that users of Maalox, Mylanta, Gaviscon , Gelusil, etc. would be in treatment everywhere . All contain aluminum hydroxide. :D
No, naked short selling is selling actual or faked shares one doesn't possess or using the allowable time between selling and delivery to buy it...
The heating would only be necessary if one was stamping out tungsten metal ( no epoxy). Tungsten granules, filament, foil, etc. doesn't need heat...
I agree . Obviously we can never know. However, maybe there was surface damage , spots, enough to lower the grade over the period of time. Have to...
Hi grade tungsten the thickness of an AGE ( 2.87mm) 1 oz. coin would have to struck while heated to 900 deg.C. to configure to the dies ( I...
Yes, but you aren't the first to ever do so. Yes, welcome to the forum, some days it can be tough crowd, but many often forget their first...
The question was already answered by reddrum previous page , so the answer here was not needed. It might be a good idea if it was sarcasm or being...
you could also bite the coin and try to bend it. if you bend it the coin is fake. if not you have a gold eagle with teethmarks :D Someone didn't...
You might reduce the spot with Verdi-care, but from the photo, I think remnants will stay and may be more noticeable than before. Do not use any...
Hi Sergio, I am a scientist also , and a long time collector and to me the coins are just a 'gadget' to get money. They have a huge premium , but...
Hi, go to the reply box and below the reply area, use the tab 'upload a file' and it should work. Then click on insert full image and it will...
The Heartland Coin club of San Diego area ( will have a show on Sat, 17th Date: May 17, 2014 Hours: 10:00AM and closes at 4PM. Location:...
Actually, Doug your scales might be exactly correct, as the nickels have a specified weight of 5 grams +/- 0.13grams, so for gov. specs, any...
But I have seen a fake one with 3 widely separated obverse images many years ago. Maybe that is where some have heard of it. If your dad...
It is the same chemical compounds from the reaction of active coin metal and environmental gases, water, and soil contaminates. The difference is...
Take care that we do not ignite another flame war! as from post #21. As long as it is not against the rules of no religion, political , or world...
My concerns on the analysis process with a touch stone and/or karat needles required : 1. very strong mineral acids which do not appear in the...
I think that there is some confusion over the use of 'touch stones" and the karat needles. The process require strong acid. The touch stone...
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