Help With Acid Test Results

[B804]

I have an engraved piece of something that may possibly be silver. I don’t know the object is. I acid tested the outside and the inside of the object. Whatever the metal is, it did not appear to be disappearing after checking it with silver testing acid and I also tested a little bit with 18k acid. I read something that said it could possibly be platinum if it doesn’t change color. I’ve posted some photos of the item and

the acid test. Any info would be appreciate. Thanks.

[amena]

Platinum has a higher specific gravity than gold. Even without a specific gravity test, you should be able to feel it in your hand.