Logansquare

I think red-mercury may be an (old old) psyop. https://gizadeathstar.com/2017/04/really-red-mercury/

goatboy

It would likely be an amalgam of either red phosphorus and mercury with a possible gallium component or nitric acid and mercury. Either way, it would be very dangerous and highly sensitive to temperature changes. If you ever see this stuff, don't walk away, RUN!