sphillips
Bronze Member
- Jan 4, 2008
- 1,046
- 1,119
- Detector(s) used
- Equinox 800
- Primary Interest:
- All Treasure Hunting
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Metal | Density |
Gold | 19.3 |
Silver | 10.5 |
Platinum | 21.4 |
Palladium | 12.0 |
Copper | 9.0 |
9ct | 10.9 to 12.7 |
14ct | 12.9 to 14.6 |
18ct Yellow | 15.2 to 15.9 |
18ct White | 14.7 to 16.9 |
22ct | 17.7 to 17.8 |
Sterling Silver | 10.2 to 10.3 |
950 Platinum | 20.1 |
Try specific gravity testing to determine the metal.
You will need a gram scale that will read .01 gram.
To find the specific gravity:
weigh the object in air, weigh it in water.
divide the difference into the weight in air.
the result is the SG and can be compared to the table at:
https://www.engineeringtoolbox.com/specific-gravity-solids-metals-d_293.html
In weighing the object I hang it from a metal gallows and thread on the scale for the in the air weight. The scale is zeroed out with the gallows and string on the scale before hanging the object from the string.
Then I fill a small pill bottle with the water and while holding the bottle locate it so I can raise the bottle submersing the object in the water. Do not let the object touch the side of the bottle or rest the bottle on the scale, it must be held to obtain the weight in water of the object.
A simple chart for what we look for:
Metal Density Gold 19.3 Silver 10.5 Platinum 21.4 Palladium 12.0 Copper 9.0 9ct 10.9 to 12.7 14ct 12.9 to 14.6 18ct Yellow 15.2 to 15.9 18ct White 14.7 to 16.9 22ct 17.7 to 17.8 Sterling Silver 10.2 to 10.3 950 Platinum 20.1
Note: the SG differences in gold and the different K (ct) of gold. This is due to the the various alloyed metals in the pure gold having different SGs themselves.
Melted silver from a shipwreck that went down from a fire!!!!!
If you believe that, I have lots of them to sell you! Only $5 oz, plus shipping. How many lbs would you like to buy? Here's a few to drool over......
I find absolutely loads of them on a local beach near me...they are a pain in the ass!Found the following at about a foot down in damp sand, no corrosion on any of them. Item second from the right is much more dull in finish than the other 3. Don't think they are silver, no tarnish. Any thoughts?
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