Mercury is silvery like most metals.
I know no use for mercury in mechanical drafting. I could imagine some conductive ink loaded with a metal powder.
It doesn't wet glass
. Do I see on the pictures that the unknown liquid adheres to the bottle?
Mercury is very
dense to our senses. Denser than steel, copper and lead. Does it feel heavier than the same volume of steel, if you're used to it? Or can you weigh the full bottle and measure its outer dimensions and estimate the inner? By shaking gently the bottle sidewise, do you feel forces much stronger than with water?
A simple test (you're not supposed to sniff the vapours for hours) is to plunge two ohmmeter electrodes in the thing, or preferably two copper wires.
- If the resistance is zero Ω, it's a liquid metal, probably mercury, or possibly a gallium alloy.
- At 1Ω to few MΩ, it's an ionic liquid.
- Over the MΩ, it's a non-ionic liquid.
In an other test, a drop of mercury reacts with aluminium to make an alloy. It punches slowly through an aluminium wrapping foil. Unfortunately, this takes some liquid outside the bottle.