sixgun

I've seen many people speak of it but never really seen anyone go into it or any detail of how its done and showed some math,  i did the following with essentially 3 types of metal, aluminium, 22ct and 24 ct, 22ct red( crown) gold is expected to have a density of about 17.5 while 24ct pure gold is expected to be around 19.3, while aluminium is 2.7:
In air (the normal weight checking on a scale):
Piece of aluminium= 1.5 grams
2015 Sovereign = 8.00 grams
1/2 ounce Krugerrand = 17.00 grams
Perth mint goat 1/2 ounce= 15.60 grams (see pic)
-------------------------------------------------------------
suspended in water (this is the actual test):
aluminium=0.95 grams
krug= 16.02 grams
Sov= 7.54 grams (see pic)
Goat= 14.80 grams (see pic)
--------------------------------------------------------
The math:
weight in air - weight in water = displacement
weight in air / displacement= specific gravity
So Aluminium 1.5 - 0.95= 0.55 (displacement)
1.5 / 0.55= specific gravity 2.72
Krug 17.00 - 16.02= 0.98
17.00/ 0.98= specific gravity 17.34
The goat has a specific gravity of 19.5
The sovereign has a specific gravity of 17.39
That's more accurate than x-rays and less destructive than just about any other method. Considering i'm not set up to lab perfect conditions  this is pretty accurate.
--------------------------------------------------------------------------------
So the specific gravity results in order again:
Aluminium= 2.72
Krugerrand= 17.34
Sovereign = 17.39
Perth Goat = 19.5 
 

i'll take 10 trays.
i like my silver pandas.

OK i'll take 9 trays then