Discussion in 'Ancient Coins' started by Cucumbor, Oct 21, 2020.
It doesn't remind me...remind me!
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Hey, even I managed to do a specific gravity test on a suspected Roman Republican fourree, and I'm a technological incompetent as well as something of a klutz -- you should have seen me trying to tie a piece of thread around the coin so it didn't fall out! I found these instructions easy to follow: http://coinsblog.ws/2016/06/detecting-counterfeits-specific-gravity.html. The one piece of equipment you'll need to make proper measurements is a digital scale that measures in 100ths of a gram rather than only 10ths of a gram. And here's a table I found listing the specific gravities of silver, copper, and alloys with various percentages of silver in a silver-copper alloy:
100% silver 10.49
100% copper 8.49
98% silver 10.45
90% silver 10.31
83.5% silver 10.20
75% silver 10.05
50% silver 9.65
40% silver 9.527
30% silver 9.37
20% silver 9.234
Yes Donna, that's the hardest part
Here I am, back with some news. I made the specific gravity test and the result leans toward the Nero denarius being a fourree
Its specific gravity is of 8.97, while I got 10.00 with the Domitian below and 10.67 with the Augustus
That said the layer must be kind of thick : I've examined the coin again and again and don't see any sign of a core pointing its nose through it
Just for the fun of it, the guy who intended to buy the coin before all that mess started, has made a superposition of different pictures (i.e. mine, CGB's and Elsen's) showing perfectly the die matches
As stated by Doug, because I'm in France and wouldn't want to sending it to the USA with the Covid situation
Anyway, thanks to everybody for their contributions, it's the kind of sleuthing which makes this hobby so enjoyable....even at the cost of a Nero denarius
@Cucumbor but if it is any consolation that is one heck of a nice fourree!
I know SGs are often dismissed by some, as you get different results on different tests (without really accurate scales and equipment etc).
One thing I will say however, although you can't trust an SG to give you an precise result, you can trust it to give you an approximate result. A result of below 9 tells you definitively it does not contain any decent amount of silver. It doesn't tell you what it is, but it tells you what it's not.
Well done on the sleuthing @Cucumbor
I'm not quite sure if I should now eat my baret silently in the corner...
Perfectly right. Although the mesure isn't accurate, one can assume the error to be the same when all the meures are made the same day in the same conditions. I found 10.67 SG on the Augustus, meaning it would be more than 100% silver (that's the first fricken good news in this story ). Also I tested two modern 835/1000 silver coins which both gave the same reslult of 9,65 SG
Well, it's up to you to keep your promise
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