I was thinking (always a dangerous thing.) When trying to identify a material, if you can measure the specific gravity of it, if you have the tools to do so.
Several years ago, I bought a digital scale via Amazon. My brand is of no importance, of course. but I got an AWS-1KG scale, probably like druggies use for sales, heh, heh. And, got a calibration weight extra. Goes to 1 kilogram (2.2 lbs.)
If you weigh the item that is part of the sp. gr. calculation. Next you need to know its volume. That takes more thinking than anything.
One possible way is to have a measuring cup big enough to put the item in. Without the item in the cup, fill the cup to a given line on the side of the cup.
Then put the item in so it is completely submerged, and see how much higher the water went in the cup. That will be your volume.
Calculate the weight per volume unit, then figure out what the weight is for water in the same volume unit. The ratio of this material to the weight of water for the same volume will be the specific gravity.
Then, find sp.gr. charts and when you find a material which has the same sp.gr, you are probably very close to having identified it.
I am aware you may have to do some serious thinking, because while I know how to do it, I don't know how to explain it without waving my hands around.
